Feature: Sélection multiple d'instruments dans les filtres

Frontend:
- FilterPanel: Remplacer select par checkboxes pour instruments
- Zone scrollable (max-height 12rem) pour la liste
- Affichage des instruments sélectionnés dans résumé filtres actifs

Backend:
- API tracks: Nouveau paramètre instruments (List[str])
- Backward compatible avec ancien paramètre instrument
- CRUD: Filtrage AND (track doit avoir TOUS les instruments)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

backend/src/api/routes/tracks.py

@@ -24,6 +24,7 @@ async def get_tracks(
     has_vocals: Optional[bool] = None,
     key: Optional[str] = None,
     instrument: Optional[str] = None,
+    instruments: Optional[List[str]] = Query(None),
     tempo_range: Optional[str] = Query(None, regex="^(slow|medium|fast)$"),
     sort_by: str = Query("analyzed_at", regex="^(analyzed_at|tempo_bpm|duration_seconds|filename|energy)$"),
     sort_desc: bool = True,
@@ -42,7 +43,8 @@ async def get_tracks(
         energy_max: Maximum energy
         has_vocals: Filter by vocal presence
         key: Filter by musical key
-        instrument: Filter by instrument
+        instrument: Filter by instrument (deprecated, use instruments)
+        instruments: Filter by multiple instruments (must have ALL)
         tempo_range: Filter by tempo range (slow: <100, medium: 100-140, fast: >140)
         sort_by: Field to sort by
         sort_desc: Sort descending
@@ -61,6 +63,9 @@ async def get_tracks(
         elif tempo_range == "fast":
             bpm_min = 140.0 if bpm_min is None else max(bpm_min, 140.0)
 
+    # Use instruments if provided, otherwise fall back to instrument
+    final_instruments = instruments if instruments else ([instrument] if instrument else None)
+
     tracks, total = crud.get_tracks(
         db=db,
         skip=skip,
@@ -73,7 +78,7 @@ async def get_tracks(
         energy_max=energy_max,
         has_vocals=has_vocals,
         key=key,
-        instrument=instrument,
+        instruments=final_instruments,
         sort_by=sort_by,
         sort_desc=sort_desc,
     )

backend/src/models/crud.py

@@ -104,7 +104,7 @@ def get_tracks(
     energy_max: Optional[float] = None,
     has_vocals: Optional[bool] = None,
     key: Optional[str] = None,
-    instrument: Optional[str] = None,
+    instruments: Optional[List[str]] = None,
     sort_by: str = "analyzed_at",
     sort_desc: bool = True,
 ) -> Tuple[List[AudioTrack], int]:
@@ -122,7 +122,7 @@ def get_tracks(
         energy_max: Maximum energy (0-1)
         has_vocals: Filter by vocal presence
         key: Filter by musical key
-        instrument: Filter by instrument
+        instruments: Filter by instruments (track must have ALL instruments in the list)
         sort_by: Field to sort by
         sort_desc: Sort descending if True
 
@@ -168,8 +168,10 @@ def get_tracks(
     if key:
         query = query.filter(AudioTrack.key == key)
 
-    if instrument:
-        query = query.filter(AudioTrack.instruments.any(instrument))
+    if instruments:
+        # Track must have ALL specified instruments
+        for instrument in instruments:
+            query = query.filter(AudioTrack.instruments.any(instrument))
 
     # Get total count before pagination
     total = query.count()