test(campaign): add route/controller tests for POST /api/v1/campaigns

[Chrisland-ui]

Summary

Adds route/controller-level tests for POST /api/v1/campaigns covering the full request pipeline: JWT auth middleware, rate limiting, Zod validation, mocked service dependencies, and the success response shape.

What was implemented

Test file: src/__tests__/campaign.controller.test.ts

Tests use Node's built-in test runner and follow the same full-HTTP-server pattern as donation.controller.test.ts. Each test spins up an Express app with campaignRoutes mounted, patches AppDataSource with in-memory repos, and uses CAIRO_MOCK=true — no real DB or chain connection required.

Auth tests (4)

• 401 AUTH_MISSING_TOKEN — no Authorization header
• 401 AUTH_INVALID_TOKEN — malformed JWT
• 401 AUTH_INVALID_TOKEN — token signed with wrong secret
• 401 AUTH_INVALID_TOKEN — token with no user identifier claim

Validation tests (6)

• 400 VALIDATION_ERROR — missing campaign_ref
• 400 VALIDATION_ERROR — campaign_ref not exactly 5 characters
• 400 VALIDATION_ERROR — missing target_amount
• 400 VALIDATION_ERROR — target_amount is zero
• 400 VALIDATION_ERROR — donation_token not a valid Starknet address
• 400 VALIDATION_ERROR — title exceeds 255 characters

DB and service error tests (4)

• 500 DB_NOT_READY — AppDataSource.isInitialized is false
• 400 WALLET_NOT_FOUND — wallet address from JWT not in the wallet repo
• 400 INSUFFICIENT_BALANCE — wallet exists but balance is zero
• 409 DUPLICATE_CAMPAIGN_REF — campaign_ref already has a completed campaign

Success tests (2)

• 201 — verifies all required fields: campaign_id, campaign_ref, target_amount, donation_token, transaction_hash, created_at (valid ISO string)
• 201 — optional title is reflected in the response

Rate-limit tests (2)

• 429 RATE_LIMITED after 5 requests from same user — verifies error.code, error.details.limit, and error.details.windowSeconds
• Per-user key isolation — a second user's first request succeeds after the first user exhausts their budget

Closes

Closes #67

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[Chrisland-ui]

@pragmaticAweds my boss please merge i really need the point