feat: initialiser le projet CVP (Next.js 14 + FastAPI + PostgreSQL)

- Frontend : Next.js 14 App Router, TypeScript strict, Tailwind 3, shadcn/ui, next-intl (fr/en)
- Backend : FastAPI, SQLAlchemy 2 async, Alembic, Pydantic 2, Python 3.11
- Infrastructure : Docker Compose (PostgreSQL 16 + Ollama)
- Tooling : ESLint + Prettier (frontend), Ruff (backend), pytest
- Structure complète des dossiers avec pages et routers placeholder

backend/app/config.py

@@ -0,0 +1,30 @@
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    postgres_host: str = "localhost"
+    postgres_port: int = 5432
+    postgres_db: str = "cvp"
+    postgres_user: str = "cvp"
+    postgres_password: str = "cvp_dev_password"
+
+    france_travail_client_id: str = ""
+    france_travail_client_secret: str = ""
+
+    adzuna_app_id: str = ""
+    adzuna_app_key: str = ""
+
+    ollama_base_url: str = "http://localhost:11434"
+    ollama_model: str = "phi3:mini"
+
+    model_config = {"env_file": ".env", "env_file_encoding": "utf-8"}
+
+    @property
+    def database_url(self) -> str:
+        return (
+            f"postgresql+asyncpg://{self.postgres_user}:{self.postgres_password}"
+            f"@{self.postgres_host}:{self.postgres_port}/{self.postgres_db}"
+        )
+
+
+settings = Settings()