feat: add settings service and config API routes

Add a key-value settings table (Setting model) with DB > env > default
resolution chain. Replace hardcoded Ollama constants in ollama_service
with dynamic _get_config() lookups. Add /api/config/ endpoints for
settings CRUD and tag management (create, rename).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/plesna_gerance/api/app.py

@@ -16,6 +16,7 @@ from .routes import (
     dashboard_router,
     revenus_router,
     ia_router,
+    config_router,
 )
 
 app = FastAPI(
@@ -43,6 +44,7 @@ app.include_router(analytics_router)
 app.include_router(dashboard_router)
 app.include_router(revenus_router)
 app.include_router(ia_router)
+app.include_router(config_router)
 
 
 # Health check endpoints (keep in main app)

src/plesna_gerance/api/routes/__init__.py

@@ -7,6 +7,7 @@ from .analytics import router as analytics_router
 from .dashboard import router as dashboard_router
 from .revenus import router as revenus_router
 from .ia import router as ia_router
+from .config import router as config_router
 
 __all__ = [
     "extraction_router",
@@ -16,4 +17,5 @@ __all__ = [
     "dashboard_router",
     "revenus_router",
     "ia_router",
+    "config_router",
 ]

src/plesna_gerance/api/routes/config.py

@@ -0,0 +1,134 @@
+"""Routes de configuration — Settings LLM et gestion des tags."""
+
+from fastapi import APIRouter, Depends, HTTPException
+from pydantic import BaseModel
+from sqlalchemy.orm import Session
+
+from ...database import get_session, DatabaseService
+from ...database.models import Tag
+from ...services.settings_service import (
+    get_all_settings,
+    set_setting,
+    delete_setting,
+    SETTINGS_REGISTRY,
+)
+
+router = APIRouter(prefix="/api/config", tags=["config"])
+
+
+# ============================================================
+# Schemas
+# ============================================================
+
+
+class SettingUpdate(BaseModel):
+    value: str
+
+
+class TagCreate(BaseModel):
+    nom: str
+
+
+class TagUpdate(BaseModel):
+    nom: str
+
+
+# ============================================================
+# Settings endpoints
+# ============================================================
+
+
+@router.get("/settings")
+async def list_settings(
+    session: Session = Depends(get_session),
+) -> dict:
+    """Liste tous les settings avec valeur et source."""
+    return get_all_settings(session)
+
+
+@router.put("/settings/{key}")
+async def update_setting(
+    key: str,
+    body: SettingUpdate,
+    session: Session = Depends(get_session),
+) -> dict:
+    """Met à jour un setting (persiste en DB)."""
+    if key not in SETTINGS_REGISTRY:
+        raise HTTPException(status_code=404, detail=f"Setting inconnu : {key}")
+    set_setting(session, key, body.value)
+    return {"key": key, "value": body.value, "source": "database"}
+
+
+@router.delete("/settings/{key}")
+async def reset_setting(
+    key: str,
+    session: Session = Depends(get_session),
+) -> dict:
+    """Reset un setting au défaut (supprime l'override DB)."""
+    if key not in SETTINGS_REGISTRY:
+        raise HTTPException(status_code=404, detail=f"Setting inconnu : {key}")
+    deleted = delete_setting(session, key)
+    # Return the resolved value after deletion
+    all_settings = get_all_settings(session)
+    return all_settings[key]
+
+
+# ============================================================
+# Tags endpoints
+# ============================================================
+
+
+@router.get("/tags")
+async def list_tags(
+    session: Session = Depends(get_session),
+) -> list[dict]:
+    """Liste tous les tags."""
+    db_service = DatabaseService(session)
+    tags = db_service.list_tags()
+    return [{"id": tag.id, "nom": tag.nom} for tag in tags]
+
+
+@router.post("/tags", status_code=201)
+async def create_tag(
+    body: TagCreate,
+    session: Session = Depends(get_session),
+) -> dict:
+    """Crée un nouveau tag (validation unicité)."""
+    nom = body.nom.strip()
+    if not nom:
+        raise HTTPException(status_code=400, detail="Le nom du tag ne peut pas être vide.")
+
+    existing = session.query(Tag).filter(Tag.nom == nom).first()
+    if existing:
+        raise HTTPException(status_code=409, detail=f"Le tag '{nom}' existe déjà.")
+
+    tag = Tag(nom=nom)
+    session.add(tag)
+    session.commit()
+    session.refresh(tag)
+    return {"id": tag.id, "nom": tag.nom}
+
+
+@router.put("/tags/{tag_id}")
+async def rename_tag(
+    tag_id: int,
+    body: TagUpdate,
+    session: Session = Depends(get_session),
+) -> dict:
+    """Renomme un tag (validation unicité)."""
+    nom = body.nom.strip()
+    if not nom:
+        raise HTTPException(status_code=400, detail="Le nom du tag ne peut pas être vide.")
+
+    tag = session.query(Tag).filter(Tag.id == tag_id).first()
+    if not tag:
+        raise HTTPException(status_code=404, detail="Tag introuvable.")
+
+    existing = session.query(Tag).filter(Tag.nom == nom, Tag.id != tag_id).first()
+    if existing:
+        raise HTTPException(status_code=409, detail=f"Le tag '{nom}' existe déjà.")
+
+    tag.nom = nom
+    session.commit()
+    session.refresh(tag)
+    return {"id": tag.id, "nom": tag.nom}