feat(memory): add an opt-in Qoder CLI memory toggle

[luoxuanzao]

Summary

• Adds an opt-in Memory toggle to Qoderian's settings (Settings → Experimental, default off). When it is on, the plugin passes { mode: 'native' } to the Qoder Agent SDK, so qodercli saves and reloads reusable information across conversations using its own memory store — the same one the terminal CLI uses.
• Memory is a query-startup option, so toggling the switch restarts the running session once.
• Covers both conversation paths (buildBaseOptions for the persistent session and the cold-start path); title generation and inline-edit helper queries are unaffected.
• The switch is rendered in both settings surfaces — Obsidian's settings tab and the in-view settings window — with strings in all 10 locales.
• Documented under [Unreleased] in CHANGELOG.md (Added).

Verification

• npm run typecheck
• npm run lint
• npm run test (167 suites, 3574 tests; 7 of them new for the toggle, the option builder, and the session restart)
• npm run build
• npm run release:check
• npm run audit:prod
• Tested affected qodercli behavior against a real CLI when applicable — enablement is passed straight through to the CLI's own memory implementation, so the CLI is exercised rather than changed; the option shape follows the SDK's MemoryOptions (mode: 'native', project/user scopes default on) from @qoder-ai/qoder-agent-sdk 1.0.41. The build was deployed to a local vault and exercised in Obsidian.

Safety

• No credentials, private vault content, internal URLs, or personal paths are included
• User-visible changes are documented in CHANGELOG.md