perf: optimize Docker build time from >10min to ~2min

- Remove sentence-transformers dependency (saves ~3GB PyTorch/CUDA)
- Make CrossEncoder import optional with graceful fallback
- Optimize Dockerfile for layer caching (incremental builds ~3s)
- Change PostgREST port from 3000 to 3001 (avoid Next.js conflict)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

servers/mcp-crawl4ai-rag/Dockerfile

@@ -1,21 +1,26 @@
 FROM python:3.12-slim
 
 ARG PORT=8051
-
 WORKDIR /app
 
-# Install uv
+# Install uv first (cached layer)
 RUN pip install uv
 
-# Copy the MCP server files
+# Copy only dependency files first (cached layer)
+COPY pyproject.toml uv.lock* ./
+
+# Install dependencies (cached unless pyproject.toml changes)
+RUN uv pip install --system .
+
+# Run crawl4ai-setup for Playwright (cached layer)
+RUN crawl4ai-setup
+
+# Copy source code last (only this invalidates on code changes)
 COPY . .
 
-# Install packages directly to the system (no virtual environment)
-# Combining commands to reduce Docker layers
-RUN uv pip install --system -e . && \
-    crawl4ai-setup
+# Re-install in editable mode (fast, deps already installed)
+RUN uv pip install --system -e . --no-deps
 
 EXPOSE ${PORT}
 
-# Command to run the MCP server
 CMD ["python", "src/crawl4ai_mcp.py"]