fix(studio): keep one minimum instance during deploy and update - #1068

Summary\n\n- set the Studio VeFaaS minimum instance count to 1 during deploy and updates\n- apply the setting before a frontend self-update publishes its new revision, and stop the update if it cannot be applied\n- preserve the existing maximum instance count by omitting it from the resource update\n- add the required VeFaaS IAM permission for deployed Studio roles and the existing one-click authorization flow\n\n## Verification\n\n- ruff check...............................................................Passed

ruff format..............................................................Passed
Detect hardcoded secrets.................................................Passed\n- ============================= test session starts ==============================
platform darwin -- Python 3.12.11, pytest-9.1.1, pluggy-1.6.0
rootdir: /Users/bytedance/Projects/veadk-python-worktrees/studio-min-instance
configfile: pytest.ini
testpaths: tests
plugins: cov-7.1.0, xdist-3.8.0, asyncio-1.4.0, anyio-4.15.0
asyncio: mode=Mode.STRICT, debug=False, asyncio_default_fixture_loop_scope=None, asyncio_default_test_loop_scope=function
collected 3697 items / 2 skipped

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=============================== warnings summary ===============================
veadk/auth/middleware/oauth2_auth.py:96
/Users/bytedance/Projects/veadk-python-worktrees/studio-min-instance/veadk/auth/middleware/oauth2_auth.py:96: AuthlibDeprecationWarning: authlib.jose module is deprecated, please use joserfc instead.
It will be compatible before version 2.0.0.
from authlib.jose import JsonWebKey, jwt

tests/cli/test_frontend_trace.py::test_build_graph_serializes_veadk_agent_model
/Users/bytedance/Projects/veadk-python-worktrees/studio-min-instance/.venv/lib/python3.12/site-packages/google/adk/cli/fast_api.py:104: PendingDeprecationWarning: Please use import python_multipart instead.
import multipart

tests/cli/test_studio_rbac.py::test_system_info_lists_configured_sandbox_tool_ids
/Users/bytedance/Projects/veadk-python-worktrees/studio-min-instance/.venv/lib/python3.12/site-packages/tos/utils.py:1034: DeprecationWarning: setDaemon() is deprecated, set the daemon attribute instead
t.setDaemon(True)

tests/cli/test_studio_rbac.py::test_system_info_lists_configured_sandbox_tool_ids
tests/cli/test_studio_rbac.py::test_system_info_lists_configured_sandbox_tool_ids
tests/cli/test_studio_rbac.py::test_system_info_lists_configured_sandbox_tool_ids
tests/cli/test_studio_rbac.py::test_system_info_prefetches_codex_model_env_state_on_startup
tests/cli/test_studio_rbac.py::test_system_info_prefetches_codex_model_env_state_on_startup
tests/cli/test_studio_rbac.py::test_system_info_prefetches_codex_model_env_state_on_startup
tests/cli/test_studio_rbac.py::test_system_info_prefetch_hides_get_tool_failures_but_reports_error_code
tests/cli/test_studio_rbac.py::test_system_info_prefetch_hides_get_tool_failures_but_reports_error_code
tests/cli/test_studio_rbac.py::test_system_info_prefetch_hides_get_tool_failures_but_reports_error_code
/Users/bytedance/Projects/veadk-python-worktrees/studio-min-instance/.venv/lib/python3.12/site-packages/tos/auth.py:293: DeprecationWarning: datetime.datetime.utcnow() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.now(datetime.UTC).
return datetime.datetime.utcnow().strftime(DATE_FORMAT)

tests/cli/test_studio_rbac.py: 16 warnings
tests/cli/test_studio_self_update.py: 1 warning
tests/utils/test_volcengine_sign.py: 2 warnings
/Users/bytedance/Projects/veadk-python-worktrees/studio-min-instance/veadk/utils/volcengine_sign.py:372: DeprecationWarning: datetime.datetime.utcnow() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.now(datetime.UTC).
now = datetime.datetime.utcnow()

tests/cloud/test_harness_app_http.py::test_harness_app_exposes_agent_info
/Users/bytedance/Projects/veadk-python-worktrees/studio-min-instance/.venv/lib/python3.12/site-packages/google/adk/runners.py:294: DeprecationWarning: The plugins argument is deprecated. Please use the app argument to provide plugins instead.
warnings.warn(

tests/cloud/test_harness_app_http.py::test_harness_app_exposes_agent_info
/Users/bytedance/Projects/veadk-python-worktrees/studio-min-instance/veadk/cloud/harness_app/app.py:247: DeprecationWarning: AdkWebServer is deprecated and has been refactored into ApiServer and DevServer. Use DevServer instead.
self._server = AdkWebServer(

tests/extensions/harness/sidecar_runtime/test_mcp_client.py::test_managed_client_normalizes_runtime_gateway_session_header
/Users/bytedance/Projects/veadk-python-worktrees/studio-min-instance/tests/extensions/harness/sidecar_runtime/test_mcp_client.py:147: DeprecationWarning: MCPToolset class is deprecated, use McpToolset instead.
toolset = MCPToolset(

tests/extensions/harness/sidecar_runtime/test_mcp_client.py::test_managed_client_normalizes_runtime_gateway_session_header
tests/extensions/harness/sidecar_runtime/test_mcp_client.py::test_managed_client_ignores_proxy_environment_for_loopback
tests/extensions/harness/sidecar_runtime/test_mcp_loopback_proxy.py::test_loopback_relay_preserves_alternate_session_without_env_proxy[/mcp]
tests/extensions/harness/sidecar_runtime/test_mcp_loopback_proxy.py::test_loopback_relay_preserves_alternate_session_without_env_proxy[/vmetrics]
/Users/bytedance/.local/share/uv/python/cpython-3.12-macos-aarch64-none/lib/python3.12/contextlib.py:105: DeprecationWarning: Use streamable_http_client instead.
self.gen = func(*args, **kwds)

tests/extensions/harness/sidecar_runtime/test_mcp_client.py::test_managed_client_normalizes_runtime_gateway_session_header
tests/extensions/harness/sidecar_runtime/test_mcp_client.py::test_managed_client_ignores_proxy_environment_for_loopback
tests/extensions/harness/sidecar_runtime/test_mcp_loopback_proxy.py::test_loopback_relay_preserves_alternate_session_without_env_proxy[/mcp]
tests/extensions/harness/sidecar_runtime/test_mcp_loopback_proxy.py::test_loopback_relay_preserves_alternate_session_without_env_proxy[/vmetrics]
tests/runtime/codex/test_codex_runtime.py::test_tool_executor_supports_stdio_mcp_toolset
tests/runtime/piagent/test_piagent_runtime.py::test_build_executable_tools_calls_real_stdio_mcp_toolset
/Users/bytedance/Projects/veadk-python-worktrees/studio-min-instance/.venv/lib/python3.12/site-packages/google/adk/tools/mcp_tool/mcp_toolset.py:356: DeprecationWarning: MCPTool class is deprecated, use McpTool instead.
mcp_tool = MCPTool(

tests/extensions/harness/sidecar_runtime/test_mcp_client.py::test_managed_client_ignores_proxy_environment_for_loopback
/Users/bytedance/Projects/veadk-python-worktrees/studio-min-instance/tests/extensions/harness/sidecar_runtime/test_mcp_client.py:194: DeprecationWarning: MCPToolset class is deprecated, use McpToolset instead.
toolset = MCPToolset(

tests/extensions/harness/sidecar_runtime/test_mcp_loopback_proxy.py::test_loopback_relay_preserves_alternate_session_without_env_proxy[/mcp]
tests/extensions/harness/sidecar_runtime/test_mcp_loopback_proxy.py::test_loopback_relay_preserves_alternate_session_without_env_proxy[/vmetrics]
/Users/bytedance/Projects/veadk-python-worktrees/studio-min-instance/tests/extensions/harness/sidecar_runtime/test_mcp_loopback_proxy.py:123: DeprecationWarning: MCPToolset class is deprecated, use McpToolset instead.
toolset = MCPToolset(

tests/plugins/test_codex_sandbox_upload.py::test_build_and_restore_preserves_worktree_and_github_auth
/Users/bytedance/Projects/veadk-python-worktrees/studio-min-instance/tests/plugins/test_codex_sandbox_upload.py:106: DeprecationWarning: Python 3.14 will, by default, filter extracted tar archives and reject files or modify their metadata. Use the filter argument to control this behavior.
archive.extractall(stage)

tests/plugins/test_codex_sandbox_upload.py::test_restore_hides_generated_section_for_tracked_handoff
/Users/bytedance/Projects/veadk-python-worktrees/studio-min-instance/tests/plugins/test_codex_sandbox_upload.py:187: DeprecationWarning: Python 3.14 will, by default, filter extracted tar archives and reject files or modify their metadata. Use the filter argument to control this behavior.
archive.extractall(stage)

tests/runtime/codex/test_codex_runtime.py::test_authenticated_tool_stores_credential_and_resumes
/Users/bytedance/Projects/veadk-python-worktrees/studio-min-instance/.venv/lib/python3.12/site-packages/google/adk/auth/auth_tool.py:94: DeprecationWarning: This method is deprecated. Use credential_key instead.
self.credential_key = self.get_credential_key()

tests/runtime/codex/test_codex_runtime.py::test_tool_executor_supports_stdio_mcp_toolset
/Users/bytedance/Projects/veadk-python-worktrees/studio-min-instance/tests/runtime/codex/test_codex_runtime.py:855: DeprecationWarning: MCPToolset class is deprecated, use McpToolset instead.
toolset = MCPToolset(

tests/runtime/piagent/test_piagent_runtime.py::test_build_executable_tools_calls_real_stdio_mcp_toolset
/Users/bytedance/Projects/veadk-python-worktrees/studio-min-instance/tests/runtime/piagent/test_piagent_runtime.py:1412: DeprecationWarning: MCPToolset class is deprecated, use McpToolset instead.
toolset = MCPToolset(

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
===== 3688 passed, 9 skipped, 2 xfailed, 52 warnings in 420.58s (0:07:00) ====== (3687 passed, 9 skipped, 2 xfailed)\n- Volcengine CLI deploy/update verified: min 0 -> 1, max remains 10, endpoint HTTP 200\n- Volcengine Studio frontend online update verified end to end:\n - removed from the Function role policy and reset min to 0\n - update was blocked before cloud resource changes and displayed the missing permission\n - the prefilled one-click IAM page preserved the existing policy and included the new permission\n - returned HTTP 200\n - retry passed permission precheck and the new Revision took over\n - final resource state: min 1, max 10; Studio endpoint HTTP 200\n- BytePlus resource update verified: min 0 -> 1, max remains 10