feat(phase-0): scaffold backend + web + docker + DB schema

- docker-compose.yml: timescaledb-ha (timescaledb 2.27 + vectorscale + pgvector + pgai)
  + backend (FastAPI, CUDA 12.1) + web (Next.js 14)
- docker-compose.gpu.yml: GPU profile overlay for RTX 3070 Ti
- build.bat: Windows bootstrap, auto-detects nvidia-smi and selects GPU/CPU compose
- backend: Dockerfile, pyproject.toml, FastAPI skeleton with /health and /health/db
- DB migration 001_init.sql: symbols (with trigram search), ohlcv_daily/1m (hypertables),
  macro_daily, trading_value_daily, news (vector embedding), predictions
  (with user_triggered flag for on-demand UX), prediction_outcomes, model_performance
- web: Next.js 14 + Tailwind + lightweight-charts placeholder
- README: KIS/DART/HuggingFace token issuance guides + 10 seed tickers + run instructions

docker-compose.yml

@@ -0,0 +1,62 @@
+name: stock_chart_site
+
+services:
+  db:
+    image: timescale/timescaledb-ha:pg16
+    container_name: scs_db
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: ${POSTGRES_USER:-stock}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-stockpw}
+      POSTGRES_DB: ${POSTGRES_DB:-stock}
+      TZ: ${TZ:-Asia/Seoul}
+    volumes:
+      - postgres_data:/home/postgres/pgdata/data
+      - ./backend/app/db/migrations:/docker-entrypoint-initdb.d:ro
+    ports:
+      - "5432:5432"
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-stock} -d ${POSTGRES_DB:-stock}"]
+      interval: 10s
+      timeout: 5s
+      retries: 10
+
+  backend:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+    container_name: scs_backend
+    restart: unless-stopped
+    env_file: .env
+    environment:
+      DATABASE_URL: postgresql+psycopg://${POSTGRES_USER:-stock}:${POSTGRES_PASSWORD:-stockpw}@db:5432/${POSTGRES_DB:-stock}
+    depends_on:
+      db:
+        condition: service_healthy
+    ports:
+      - "${BACKEND_PORT:-8000}:8000"
+    volumes:
+      - ./backend:/app
+      - hf_cache:/root/.cache/huggingface
+
+  web:
+    build:
+      context: ./web
+      dockerfile: Dockerfile
+    container_name: scs_web
+    restart: unless-stopped
+    env_file: .env
+    environment:
+      NEXT_PUBLIC_API_BASE: ${NEXT_PUBLIC_API_BASE:-http://localhost:8000}
+    depends_on:
+      - backend
+    ports:
+      - "${WEB_PORT:-3000}:3000"
+    volumes:
+      - ./web:/app
+      - /app/node_modules
+      - /app/.next
+
+volumes:
+  postgres_data:
+  hf_cache: