Add batch URL submission for evaluating up to 50 repos sequentially (Vibe Kanban)

[cteyton]

Summary

• Adds a batch evaluation mode to the web UI that allows users to submit up to 50 Git repository URLs at once for sequential evaluation
• The batch feature is only available in self-hosted mode (when --cloud is not set at runtime), keeping the cloud experience unchanged
• URLs are processed strictly one at a time — the next evaluation starts only after the previous one completes or fails

Why

Evaluating multiple repositories one-by-one through the UI is tedious. Users running the evaluator locally or on their own infrastructure need a way to queue up a batch of repos and let the tool work through them without manual intervention.

What changed

Backend

• BatchManager (src/api/jobs/batch-manager.ts): New orchestration class that manages batch lifecycle — validates URLs, rate-limits upfront, submits jobs sequentially using JobManager.onJobFinished callbacks, and auto-cleans stale batches after 2 hours
• JobManager hooks (src/api/jobs/job-manager.ts): Added onJobFinished callback mechanism so BatchManager gets notified when each job reaches a terminal state
• Batch API routes (src/api/routes/evaluation.ts, src/api/index.ts): POST /api/evaluate/batch to create a batch, GET /api/evaluate/batch/:batchId to poll status. Routes are wired before /api/evaluate/:id to avoid route collision
• Shared types (src/shared/types/api.ts): BatchEntryStatus, IBatchEvaluateRequest, IBatchEvaluateResponse, IBatchStatusResponse
• Git URL validation (src/shared/file-system/git-url-validation.ts): Backend mirror of the frontend URL validator (separate build targets prevent sharing)

Frontend

• Input mode toggle (frontend/src/components/RepositoryUrlInput.tsx): Single/Batch button group (hidden in cloud mode) with a textarea for pasting URLs one-per-line, real-time validation, and count feedback
• Batch status page (frontend/src/components/BatchStatusPage.tsx): New route at /batch/:batchId with 3-second polling, progress bar, status badges per job, and links to completed evaluation results
• API hook (frontend/src/hooks/useEvaluationApi.ts): Added submitBatch() and getBatchStatus() methods
• App integration (frontend/src/App.tsx): Batch submit handler, route registration (conditionally excluded in cloud mode)

Tests

• 16 new tests (src/api/jobs/batch-manager.test.ts): Covers batch creation, URL validation, sequential processing flow, status computation, and error handling

Implementation details

• Sequential processing: BatchManager uses a drip-feed pattern — it submits job Add individual evaluator selection with multi-select dropdown (Vibe Kanban) #1, then listens via onJobFinished callback to submit job Add batch URL submission for evaluating up to 50 repos sequentially (Vibe Kanban) #2, and so on. This guarantees only one batch job runs at a time.
• Rate limiting: The entire batch size is checked against the daily rate limiter upfront before any jobs are submitted, avoiding partial batch failures mid-way.
• Cloud mode gating: BatchManager is instantiated as null when cloud mode is active. The batch routes return 403, and the frontend toggle is hidden.
• Auto-cleanup: Stale batch records are pruned every 30 minutes (2-hour TTL) to prevent memory leaks from abandoned batches.

---

This PR was written using Vibe Kanban