chore: add Docker dev files and ignore .sql database dumps

Added Dockerfile.dev for backend and frontend, docker-compose.dev.yml
for local development. Added *.sql to .gitignore to prevent accidental
commit of database dumps.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker-compose.dev.yml

@@ -0,0 +1,64 @@
+name: resolutionflow
+services:
+  db:
+    image: postgres:16-alpine
+    container_name: resolutionflow_postgres
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_DB: resolutionflow
+    ports:
+      - "5432:5432"
+    volumes:
+      - rf_postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  backend:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile.dev
+    container_name: resolutionflow_backend
+    ports:
+      - "8000:8000"
+    volumes:
+      - ./backend:/app
+    environment:
+      - APP_NAME=ResolutionFlow
+      - DEBUG=true
+      - DATABASE_URL=postgresql+asyncpg://postgres:postgres@db:5432/resolutionflow
+      - DATABASE_URL_SYNC=postgresql://postgres:postgres@db:5432/resolutionflow
+      - SECRET_KEY=${SECRET_KEY}
+      - ALGORITHM=HS256
+      - ACCESS_TOKEN_EXPIRE_MINUTES=15
+      - REFRESH_TOKEN_EXPIRE_DAYS=7
+      - FEEDBACK_EMAIL=feedback@resolutionflow.com
+      - AI_PROVIDER=anthropic
+      - ANTHROPIC_API_KEY=${ANTHROPIC_API_KEY}
+      - GOOGLE_AI_API_KEY=${GOOGLE_AI_API_KEY}
+      - CORS_ORIGINS=["http://localhost:3000","http://localhost:5173"]
+    depends_on:
+      db:
+        condition: service_healthy
+
+  frontend:
+    build:
+      context: ./frontend
+      dockerfile: Dockerfile.dev
+    container_name: resolutionflow_frontend
+    ports:
+      - "5173:5173"
+    volumes:
+      - ./frontend:/app
+      - /app/node_modules
+    environment:
+      - VITE_API_URL=http://localhost:8000
+    depends_on:
+      - backend
+
+volumes:
+  rf_postgres_data:
+