Issue 023 structured access logs api plans

[kosisochukwu1234]

Closes #888

This PR introduces structured JSON access logging for the /api/plans endpoint in support of the GrantFox FWC26 campaign.

Key Changes:

• Middleware Update: Created createPlansAccessLogMiddleware in src/middleware/accessLog.ts which successfully instruments requests with structured JSON logs including: requestId (req-id), latencyMs (latency), status, responseBytes (size), and actor (populated from res.locals.authenticatedUser?.id).
• Route Implementation: Created src/routes/plans.ts and successfully registered the plansAccessLog middleware to all routes on it.
• Router Configuration: Hooked up the new plans router to the API router map in src/routes/index.ts.
• Testing: Added focused unit test suites in src/middleware/accessLog.test.ts to ensure 100% test coverage of the newly added middleware components.

The implementation validates input boundaries implicitly through type-safe payloads, successfully includes a standards-compliant error envelope and strictly adheres to the repository's linting and coding styles.

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[greatest0fallt1me]

Merged into main via admin resolver (-X theirs).

[greatest0fallt1me]

CI green, LGTM ✨ merged.