add project structure files

TASKLIST.md

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+# Task List
+
+Prioritized, actionable tasks. Each task is small and completable in one session.
+
+---
+
+## Priority 1: Pending Commit
+
+| Status | Task
+|--------|--------------------------------------------------------------
+| ☐      | Commit abuse prevention feature (dedup changes in routes.py, config.py, database.py)
+| ☐      | Commit documentation updates (api.md, README.md)
+
+## Priority 2: Test Coverage
+
+| Status | Task
+|--------|--------------------------------------------------------------
+| ☐      | Run test suite, verify all tests pass
+| ☐      | Add test for dedup window expiry behavior
+| ☐      | Add test for concurrent identical submissions
+| ☐      | Add test for MIME detection edge cases (empty content, truncated headers)
+| ☐      | Measure and document test coverage percentage
+
+## Priority 3: Documentation
+
+| Status | Task
+|--------|--------------------------------------------------------------
+| ☐      | Add deployment examples to documentation/deployment.md
+| ☐      | Document environment variables in one canonical location
+| ☐      | Add troubleshooting section to README.md
+| ☐      | Create CONTRIBUTING.md with development setup
+
+## Priority 4: Operations
+
+| Status | Task
+|--------|--------------------------------------------------------------
+| ☐      | Add SQLite WAL mode for better concurrency
+| ☐      | Add /metrics endpoint skeleton (for future Prometheus)
+| ☐      | Add structured logging option via environment variable
+| ☐      | Optimize container build with multi-stage Containerfile
+
+## Completed
+
+| Date       | Task
+|------------|--------------------------------------------------------------
+| 2024-12    | Implement content-hash deduplication
+| 2024-12    | Add X-Proxy-Secret validation
+| 2024-12    | Add X-Request-ID tracing
+| 2024-11    | Implement security headers
+| 2024-11    | Add client certificate authentication
+| 2024-11    | Create test suite
+
+---
+
+## Task Guidelines
+
+- Tasks should be completable in < 2 hours
+- Each task results in one atomic commit
+- Mark ☑ when complete, move to Completed section
+- Remove tasks that become irrelevant
+- Pull new tasks from TODO.md as capacity allows