refactor(tts): replace Minimax+Freesound with Piper TTS

Remove Minimax Speech API and Freesound integrations entirely.
Add Piper TTS as the sole TTS provider via configurable HTTP URL.

- Add piper_config DB table (url field, per-user)
- Add GET/POST /api/piper/config routes
- Python: replace generate_tts_minimax with generate_tts_piper (GET ?text=, WAV→MP3)
- Simplify generate_tts_with_subs: piper_url param replaces tts_provider+minimax fields
- Drop ttsVoice/ttsProvider from all UI, API, and background job params
- Settings page: replace Minimax+Freesound cards with single Piper URL input
- Remove freeSoundService init from server startup and CSP headers

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

server/index.ts

@@ -15,7 +15,6 @@ import { ensureAdminUserExists } from "./init-admin";
 import { startTokenCron } from "./cron";
 import { migrate } from "./migrate";
 import { jamendoService } from "./services/jamendo";
-import { freeSoundService } from "./services/freesound";
 import { ffmpegService } from "./services/ffmpeg";
 
 const app = express();
@@ -34,8 +33,8 @@ app.use(helmet({
       styleSrc: ["'self'", "'unsafe-inline'", "https://fonts.googleapis.com"],
       imgSrc: ["'self'", "data:", "https:", "blob:"],
       fontSrc: ["'self'", "https://fonts.gstatic.com"],
-      connectSrc: ["'self'", "https://graph.facebook.com", "https://openrouter.ai", "https://res.cloudinary.com", "https://freesound.org", "wss:", "ws:"],
-      mediaSrc: ["'self'", "https://cdn.freesound.org", "https:", "data:"],
+      connectSrc: ["'self'", "https://graph.facebook.com", "https://openrouter.ai", "https://res.cloudinary.com", "wss:", "ws:"],
+      mediaSrc: ["'self'", "https:", "data:"],
     }
   },
   crossOriginEmbedderPolicy: false,
@@ -209,33 +208,6 @@ app.use((req, res, next) => {
   const jamendoClientId = process.env.JAMENDO_CLIENT_ID || '5b6bba49';
   jamendoService.configure(jamendoClientId);
 
-  // Configurer le service FreeSound pour les Reels
-  // 1. Essayer de charger depuis la DB (suppose un utilisateur admin ou premier utilisateur)
-  // Note: Dans un contexte multi-utilisateur, cela devrait être fait par requête.
-  // Pour l'instant, on charge la config du premier user trouvé ou via variable d'env.
-
-  let freesoundConfigured = false;
-  try {
-    const { storage } = await import("./storage");
-    const allUsers = await storage.getAllUsers();
-    if (allUsers.length > 0) {
-      const dbConfig = await storage.getFreesoundConfig(allUsers[0].id);
-      if (dbConfig && dbConfig.clientId && dbConfig.clientSecret) {
-        freeSoundService.configure(dbConfig.clientId, dbConfig.clientSecret);
-        freesoundConfigured = true;
-        log('🎵 FreeSound configured from Database');
-      }
-    }
-  } catch (err) {
-    console.warn('Failed to load Freesound config from DB:', err);
-  }
-
-  if (!freesoundConfigured && process.env.FREESOUND_CLIENT_ID && process.env.FREESOUND_CLIENT_SECRET) {
-    freeSoundService.configure(process.env.FREESOUND_CLIENT_ID, process.env.FREESOUND_CLIENT_SECRET);
-    log('🎵 FreeSound configured from Environment Variables');
-  } else if (!freesoundConfigured) {
-    log('⚠️ FreeSound credentials not found - music search will be disabled');
-  }
 
   // Configurer le service FFmpeg pour le traitement vidéo (si configuré)
   if (process.env.FFMPEG_API_URL && process.env.FFMPEG_API_KEY) {