Add Bandcamp/YouTube links on all recs, Fix My Playlist, configurable rec count

- Bandcamp: match artist+song, fall back to artist-only page
- YouTube fallback: if not on Bandcamp, link to YouTube music video search
- Fix My Playlist: AI analyzes playlist, finds outliers, suggests replacements
- User chooses recommendation count (5, 10, 15, 20)

backend/app/services/recommender.py

@@ -1,5 +1,6 @@
 import json
 from datetime import datetime, timezone, timedelta
+from urllib.parse import quote_plus
 
 import anthropic
 from sqlalchemy import select, func
@@ -90,6 +91,7 @@ async def generate_recommendations(
     mode: str = "discover",
     adventurousness: int = 3,
     exclude: str | None = None,
+    count: int = 5,
 ) -> tuple[list[Recommendation], int | None]:
     """Generate AI music recommendations using Claude."""
 
@@ -184,7 +186,7 @@ Already in their library (do NOT recommend these):
 {disliked_instruction}
 {exclude_instruction}
 
-Respond with exactly {"15" if bandcamp_mode else "5"} music recommendations as a JSON array. Each item should have:
+Respond with exactly {count * 3 if bandcamp_mode else count} music recommendations as a JSON array. Each item should have:
 - "title": song title
 - "artist": artist name
 - "album": album name (if known)
@@ -219,33 +221,41 @@ Return ONLY the JSON array, no other text."""
     # Save to DB — in bandcamp mode, only keep results verified on Bandcamp
     recommendations = []
     for rec in recs_data:
-        if len(recommendations) >= 5:
+        if len(recommendations) >= count:
             break
 
+        artist = rec.get("artist", "Unknown")
+        title = rec.get("title", "Unknown")
         bandcamp_url = None
-        if bandcamp_mode:
-            try:
-                match = await search_bandcamp_verified(
-                    rec.get("artist", ""), rec.get("title", "")
-                )
-                if match:
-                    bandcamp_url = match.get("bandcamp_url")
-                else:
-                    # Not verified on Bandcamp — skip
-                    continue
-            except Exception:
-                continue
+        youtube_url = None
+
+        # Try Bandcamp for every recommendation
+        try:
+            match = await search_bandcamp_verified(artist, title)
+            if match:
+                bandcamp_url = match.get("bandcamp_url")
+        except Exception:
+            pass
+
+        if bandcamp_mode and not bandcamp_url:
+            # In bandcamp mode, skip recommendations not found on Bandcamp
+            continue
+
+        # If not on Bandcamp, build a YouTube search link
+        if not bandcamp_url:
+            youtube_url = f"https://www.youtube.com/results?search_query={quote_plus(f'{artist} {title} official music video')}"
 
         r = Recommendation(
             user_id=user.id,
             playlist_id=playlist_id,
-            title=rec.get("title", "Unknown"),
-            artist=rec.get("artist", "Unknown"),
+            title=title,
+            artist=artist,
             album=rec.get("album"),
             reason=rec.get("reason", ""),
             score=rec.get("score"),
             query=query,
             bandcamp_url=bandcamp_url,
+            youtube_url=youtube_url,
         )
         db.add(r)
         recommendations.append(r)