feat: add debug page with tables and logs viewer (Step 1)

Backend:
- Add /debug/tables endpoint to dump SQLite tables
- Add /debug/logs endpoint to read scrap.log

Frontend:
- Add react-router-dom for navigation
- Create HomePage and DebugPage components
- Add navigation bar with Debug link
- Style debug page with Gruvbox theme
- Fix package.json dependencies versions

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app/api/__init__.py

@@ -1,10 +1,12 @@
 """Module routers."""
 from .routes_config import router as config_router
+from .routes_debug import router as debug_router
 from .routes_products import router as products_router
 from .routes_scrape import router as scrape_router
 
 __all__ = [
     "config_router",
+    "debug_router",
     "products_router",
     "scrape_router",
 ]

backend/app/api/routes_debug.py

@@ -0,0 +1,115 @@
+from __future__ import annotations
+
+import json
+from pathlib import Path
+from typing import Any
+
+from fastapi import APIRouter, Depends, Query
+from sqlalchemy.orm import Session
+
+from backend.app.api.deps import get_db
+from backend.app.db.models import Product, ProductSnapshot, ScrapeRun
+
+router = APIRouter(prefix="/debug", tags=["debug"])
+
+LOGS_DIR = Path(__file__).resolve().parent.parent.parent / "logs"
+
+
+@router.get("/tables")
+def get_tables(
+    limit: int = Query(default=50, le=200),
+    db: Session = Depends(get_db),
+) -> dict[str, Any]:
+    """Dump des tables SQLite pour debug (products, snapshots, scrape_runs)."""
+    products = db.query(Product).order_by(Product.id.desc()).limit(limit).all()
+    snapshots = db.query(ProductSnapshot).order_by(ProductSnapshot.id.desc()).limit(limit).all()
+    scrape_runs = db.query(ScrapeRun).order_by(ScrapeRun.id.desc()).limit(limit).all()
+
+    return {
+        "products": [
+            {
+                "id": p.id,
+                "boutique": p.boutique,
+                "url": p.url,
+                "asin": p.asin,
+                "titre": p.titre,
+                "url_image": p.url_image,
+                "categorie": p.categorie,
+                "type": p.type,
+                "actif": p.actif,
+                "cree_le": p.cree_le.isoformat() if p.cree_le else None,
+                "modifie_le": p.modifie_le.isoformat() if p.modifie_le else None,
+            }
+            for p in products
+        ],
+        "snapshots": [
+            {
+                "id": s.id,
+                "produit_id": s.produit_id,
+                "run_scrap_id": s.run_scrap_id,
+                "scrape_le": s.scrape_le.isoformat() if s.scrape_le else None,
+                "prix_actuel": s.prix_actuel,
+                "prix_conseille": s.prix_conseille,
+                "prix_min_30j": s.prix_min_30j,
+                "etat_stock": s.etat_stock,
+                "en_stock": s.en_stock,
+                "note": s.note,
+                "nombre_avis": s.nombre_avis,
+                "prime": s.prime,
+                "choix_amazon": s.choix_amazon,
+                "offre_limitee": s.offre_limitee,
+                "exclusivite_amazon": s.exclusivite_amazon,
+                "statut_scrap": s.statut_scrap,
+                "message_erreur": s.message_erreur,
+            }
+            for s in snapshots
+        ],
+        "scrape_runs": [
+            {
+                "id": r.id,
+                "demarre_le": r.demarre_le.isoformat() if r.demarre_le else None,
+                "termine_le": r.termine_le.isoformat() if r.termine_le else None,
+                "statut": r.statut,
+                "nb_total": r.nb_total,
+                "nb_ok": r.nb_ok,
+                "nb_echec": r.nb_echec,
+                "chemin_log": r.chemin_log,
+            }
+            for r in scrape_runs
+        ],
+    }
+
+
+@router.get("/logs")
+def get_logs(
+    lines: int = Query(default=100, le=1000),
+) -> dict[str, Any]:
+    """Lecture des dernières lignes du fichier de log scrap."""
+    log_file = LOGS_DIR / "scrap.log"
+
+    if not log_file.exists():
+        return {"logs": [], "file": str(log_file), "exists": False}
+
+    # Lire les dernières lignes
+    with open(log_file, encoding="utf-8") as f:
+        all_lines = f.readlines()
+
+    recent_lines = all_lines[-lines:]
+
+    # Parser les lignes JSON si possible
+    parsed_logs = []
+    for line in recent_lines:
+        line = line.strip()
+        if not line:
+            continue
+        try:
+            parsed_logs.append(json.loads(line))
+        except json.JSONDecodeError:
+            parsed_logs.append({"raw": line})
+
+    return {
+        "logs": parsed_logs,
+        "file": str(log_file),
+        "exists": True,
+        "total_lines": len(all_lines),
+    }

backend/app/main.py

@@ -5,7 +5,7 @@ from os import getenv
 from fastapi import FastAPI
 from dotenv import load_dotenv
 
-from backend.app.api import routes_config, routes_products, routes_scrape
+from backend.app.api import routes_config, routes_debug, routes_products, routes_scrape
 from backend.app.core.logging import logger
 from backend.app.core.scheduler import start_scheduler
 from backend.app.db.database import Base, engine
@@ -17,6 +17,7 @@ app = FastAPI(title="suivi_produit")
 app.include_router(routes_products.router)
 app.include_router(routes_scrape.router)
 app.include_router(routes_config.router)
+app.include_router(routes_debug.router)
 
 
 @app.on_event("startup")