feat: Phase 3 AI Radio (DJ Host & interleaved playlist) and Like/Dislike/Delete actions

- Add Like button: promotes wave track to permanent library and refills buffer
- Add Dislike button: blacklists track in SQLite disliked_tracks, removes audio, refills buffer
- Add Delete button in history table for library file removal
- Add AI Radio module: wttr.in weather, Qwen 2.5 host monologues, speech synthesis, ID3 tags
- Generate interleaved 'AI Радио.m3u8' alongside clean 'Моя Волна.m3u8'
- Update Web UI with Radio DJ card, voice selection, and track actions

app/db.py

@@ -44,6 +44,17 @@ def init_db():
         updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
     )
     """)
+
+    # Disliked / Blacklisted tracks table
+    cursor.execute("""
+    CREATE TABLE IF NOT EXISTS disliked_tracks (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        artist TEXT NOT NULL,
+        title TEXT NOT NULL,
+        disliked_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        UNIQUE(artist, title)
+    )
+    """)
     
     conn.commit()
     conn.close()
@@ -66,6 +77,42 @@ def record_downloaded_track(service: str, service_id: str, artist: str, title: s
     conn.commit()
     conn.close()
 
+def remove_downloaded_track(file_path: str):
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute("DELETE FROM downloaded_tracks WHERE file_path = ?", (file_path,))
+    conn.commit()
+    conn.close()
+
+def add_disliked_track(artist: str, title: str):
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute("""
+    INSERT OR IGNORE INTO disliked_tracks (artist, title)
+    VALUES (?, ?)
+    """, (artist.strip(), title.strip()))
+    conn.commit()
+    conn.close()
+
+def get_disliked_track_keys() -> set:
+    import re
+    def _norm(s: str) -> str:
+        s = s.lower()
+        s = re.sub(r"[^\w\s]", "", s)
+        return " ".join(s.split())
+
+    conn = get_db()
+    cursor = conn.cursor()
+    cursor.execute("SELECT artist, title FROM disliked_tracks")
+    keys = set()
+    for r in cursor.fetchall():
+        art = _norm(r[0])
+        tit = _norm(r[1])
+        if art and tit:
+            keys.add(f"{art}|{tit}")
+    conn.close()
+    return keys
+
 def get_recent_tracks(limit: int = 50) -> List[Dict[str, Any]]:
     conn = get_db()
     cursor = conn.cursor()