fix: resolve all 7 Phase 1 setup/infra issues
V1.01: Add fastembed, httpx, redis to requirements.txt (now 10 lines, 9 deps)
V1.03: Create setup/setup_db.py — idempotent SQLite schema for state.db + memory_store.db
V1.04: Create .dockerignore (21 patterns — .env, *.key, __pycache__, etc.)
V1.05: Dockerfile COPY --chown=appuser:appuser (after useradd, before USER switch)
V1.06: Add EXPOSE 8000 + HEALTHCHECK (Redis ping, 30s interval)
V1.07: Document database setup as Step 2 in install.md (pip install + setup_db.py + table listing)
V1.08: Remove change-me from REDIS_PASSWORD in .env.example
V1.09: Replace gcc with build-essential + python3-dev in Dockerfile
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