Initial MobilityOps build pack (docs, contracts, scaffold)

backend/app/core/config.py

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+from functools import lru_cache
+
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    model_config = SettingsConfigDict(env_file=".env", extra="ignore")
+
+    mobilityops_env: str = "development"
+    mobilityops_demo_mode: bool = True
+    database_url: str = "postgresql+psycopg://mobilityops:mobilityops@db:5432/mobilityops"
+    knowledge_provider: str = "demo"
+    ragcore_base_url: str = "http://ragcore-api:8000"
+    ragcore_tenant: str = "northstar-mobility-demo"
+    ragcore_workspace: str = "mobilityops"
+    ragcore_collection: str = "internal-procedures"
+    n8n_webhook_url: str = "http://n8n:5678/webhook/mobilityops-return"
+
+
+@lru_cache
+def get_settings() -> Settings:
+    return Settings()

backend/app/main.py

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+from fastapi import FastAPI
+
+from app.core.config import get_settings
+
+settings = get_settings()
+app = FastAPI(title="MobilityOps API", version="0.0.1")
+
+
+@app.get("/health")
+def health() -> dict[str, str]:
+    return {"status": "ok", "service": "mobilityops-api"}
+
+
+@app.get("/api/v1/system/status")
+def system_status() -> dict[str, object]:
+    return {
+        "service": "mobilityops-api",
+        "environment": settings.mobilityops_env,
+        "demo_mode": settings.mobilityops_demo_mode,
+        "knowledge_provider": settings.knowledge_provider,
+        "scaffold": True,
+    }