feat(jobs): add Zod per-type validation to POST /api/jobs/enqueue

[jabir-dev788]

Closes #331

What this does

Adds strict Zod schema validation to POST /api/jobs/enqueue before jobs enter the queue.

Changes

• src/routes/jobs.ts: validate request body against per-type schemas
• src/jobs/types.ts: aligned Zod schemas with existing type definitions
• src/lib/validation.ts: extended with reusable validation helpers
• src/tests/enqueueOptions.test.ts: added tests for valid/invalid payloads and bounds

Test coverage

All edge cases covered: invalid payload shape, out-of-bounds maxAttempts/delayMs, unknown job type. 44 tests passing.

Notes

No changes to queue logic or handlers. Validation only at the route boundary.

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