feat: migrate to docker-compose with selfhosted-supabase-mcp

- Replace legacy directory structure (api/, db/, functions/, logs/, pooler/) with
  single docker-compose.yml based self-hosted setup
- Add selfhosted-supabase-mcp TypeScript MCP server for database management
- Add .dockerignore for Docker build context
- Update .gitignore to exclude .env files, volumes/, backups, logs

selfhosted-supabase-mcp/Dockerfile

@@ -0,0 +1,18 @@
+# Generated by https://smithery.ai. See: https://smithery.ai/docs/build/project-config
+# Use official Node.js LTS on Alpine
+FROM node:lts-alpine
+
+WORKDIR /app
+
+# Install dependencies (including dev for build)
+COPY package.json package-lock.json ./
+RUN npm install
+
+# Copy remaining source files
+COPY . .
+
+# Build the project
+RUN npm run build
+
+# Entrypoint for MCP server
+ENTRYPOINT ["node", "dist/index.js"]