Add api/ and web/ via git subtree; add docker-compose.yml and unified .gitignore

.gitignore

@@ -0,0 +1,31 @@
+# Python
+__pycache__/
+*.py[cod]
+*.egg-info/
+.venv/
+.uv/
+.env
+.env.*.local
+.pytest_cache/
+.mypy_cache/
+
+# Node / Vite
+node_modules/
+dist/
+.build/
+.vite/
+*.log
+
+# Editor/OS
+.DS_Store
+Thumbs.db
+.vscode/
+.idea/
+
+# API storage & logs
+api/storage/
+api/usda_vision_system.log
+
+# Docker
+*.pid
+

docker-compose.yml

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+version: "3.9"
+
+services:
+  api:
+    image: python:3.11-slim
+    working_dir: /app
+    volumes:
+      - ./api:/app
+      - ./api/storage:/app/storage
+    environment:
+      - PYTHONUNBUFFERED=1
+    command: >
+      sh -lc "
+        if [ -f requirements.txt ]; then pip install --no-cache-dir -r requirements.txt; else pip install --no-cache-dir -e .; fi;
+        uvicorn usda_vision_system.api.server:app --host 0.0.0.0 --port 8000 --reload
+      "
+    ports:
+      - "8000:8000"
+    depends_on:
+      - mqtt
+
+  web:
+    image: node:20-alpine
+    working_dir: /app
+    volumes:
+      - ./web:/app
+    environment:
+      - CHOKIDAR_USEPOLLING=true
+      - VITE_SUPABASE_URL=${VITE_SUPABASE_URL}
+      - VITE_SUPABASE_ANON_KEY=${VITE_SUPABASE_ANON_KEY}
+    command: >
+      sh -lc "
+        npm ci;
+        npm run dev -- --host 0.0.0.0 --port 5173
+      "
+    ports:
+      - "5173:5173"
+
+  mqtt:
+    image: eclipse-mosquitto:2
+    ports:
+      - "1883:1883"
+    volumes:
+      - mosquitto-data:/mosquitto/data
+      - mosquitto-conf:/mosquitto/config
+
+volumes:
+  mosquitto-data:
+  mosquitto-conf:
+