Add microservices, web UI, and replay tooling

services/common/settings.py

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+from __future__ import annotations
+
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    model_config = SettingsConfigDict(env_prefix="CATAN_", env_file=".env", extra="ignore")
+
+    env: str = "dev"
+    debug: bool = False
+
+    database_url: str = "postgresql+psycopg://catan:catan@db:5432/catan"
+
+    jwt_secret: str = "change-me"
+    jwt_algorithm: str = "HS256"
+    jwt_exp_hours: int = 24 * 7
+
+    api_service_url: str = "http://api:8000"
+    game_service_url: str = "http://game:8001"
+    ai_service_url: str = "http://ai:8002"
+    analytics_service_url: str = "http://analytics:8003"
+
+    models_dir: str = "/models"
+    replay_dir: str = "/replays"
+
+    cors_origins: str = "*"
+
+
+settings = Settings()