feat: dockerfiles and full docker-compose orchestration

Add multi-stage Dockerfiles for Python services (Dockerfile.service) and
React dashboard (Dockerfile.dashboard + nginx.conf). Update docker-compose.yml
with all seven application services: news-fetcher, sentiment-analyzer,
signal-generator, trade-executor, learning-engine, api-gateway, and dashboard.

docker-compose.yml

@@ -1,4 +1,7 @@
 services:
+  # ---------------------------------------------------------------------------
+  # Infrastructure
+  # ---------------------------------------------------------------------------
   postgres:
     image: timescale/timescaledb:latest-pg16
     environment:
@@ -34,6 +37,111 @@ services:
     volumes:
       - ollama_models:/root/.ollama
 
+  # ---------------------------------------------------------------------------
+  # Application services
+  # ---------------------------------------------------------------------------
+  news-fetcher:
+    build:
+      context: .
+      dockerfile: docker/Dockerfile.service
+      args:
+        EXTRAS: "news"
+        SERVICE_MODULE: "news_fetcher"
+    depends_on:
+      postgres:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    env_file: .env
+    restart: unless-stopped
+
+  sentiment-analyzer:
+    build:
+      context: .
+      dockerfile: docker/Dockerfile.service
+      args:
+        EXTRAS: "sentiment"
+        SERVICE_MODULE: "sentiment_analyzer"
+    depends_on:
+      redis:
+        condition: service_healthy
+      ollama:
+        condition: service_started
+    env_file: .env
+    restart: unless-stopped
+
+  signal-generator:
+    build:
+      context: .
+      dockerfile: docker/Dockerfile.service
+      args:
+        EXTRAS: "trading"
+        SERVICE_MODULE: "signal_generator"
+    depends_on:
+      postgres:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    env_file: .env
+    restart: unless-stopped
+
+  trade-executor:
+    build:
+      context: .
+      dockerfile: docker/Dockerfile.service
+      args:
+        EXTRAS: "trading"
+        SERVICE_MODULE: "trade_executor"
+    depends_on:
+      postgres:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    env_file: .env
+    restart: unless-stopped
+
+  learning-engine:
+    build:
+      context: .
+      dockerfile: docker/Dockerfile.service
+      args:
+        EXTRAS: "trading"
+        SERVICE_MODULE: "learning_engine"
+    depends_on:
+      postgres:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    env_file: .env
+    restart: unless-stopped
+
+  api-gateway:
+    build:
+      context: .
+      dockerfile: docker/Dockerfile.service
+      args:
+        EXTRAS: "api,trading,backtester"
+        SERVICE_MODULE: "api_gateway"
+    depends_on:
+      postgres:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    ports:
+      - "8000:8000"
+    env_file: .env
+    restart: unless-stopped
+
+  dashboard:
+    build:
+      context: .
+      dockerfile: docker/Dockerfile.dashboard
+    depends_on:
+      - api-gateway
+    ports:
+      - "3000:80"
+    restart: unless-stopped
+
 volumes:
   pgdata:
   redisdata: