refactor: remove Piper TTS, keep edge_tts only

- Remove piper_url from ReelRequest model and all function signatures
- Remove generate_tts_piper() function and Piper branch in generate_tts_with_subs()
- Remove /api/piper/config routes from server/routes.ts
- Remove piperConfig table, schemas and storage methods
- Remove piper_config migration
- Remove Piper TTS settings UI card
- Update "Piper TTS" labels to "TTS — voix activée"

edge_tts is now the only TTS engine, using precise word-boundary timing

server/storage.ts

@@ -31,9 +31,6 @@ import {
   musicFavorites,
   type MusicFavorite,
   type InsertMusicFavorite,
-  piperConfig,
-  type PiperConfig,
-  type InsertPiperConfig,
   audioTracks,
   type AudioTrack,
   type InsertAudioTrack,
@@ -120,15 +117,11 @@ export interface IStorage {
 
   // Audio Tracks
   getAudioTracks(): Promise<AudioTrack[]>;
+  // Audio Tracks
   getAudioTrack(id: string): Promise<AudioTrack | undefined>;
   createAudioTrack(track: InsertAudioTrack): Promise<AudioTrack>;
   deleteAudioTrack(id: string): Promise<void>;
 
-  // Piper Config
-  getPiperConfig(userId: string): Promise<PiperConfig | undefined>;
-  createPiperConfig(config: InsertPiperConfig): Promise<PiperConfig>;
-  updatePiperConfig(userId: string, config: Partial<InsertPiperConfig>): Promise<PiperConfig>;
-
   // App Config
   getAppConfig(): Promise<AppConfig | undefined>;
   upsertAppConfig(data: Partial<Pick<AppConfig, 'externalApiKey'>>): Promise<AppConfig>;
@@ -590,24 +583,6 @@ export class DatabaseStorage implements IStorage {
     const [created] = await db.insert(appConfig).values(data).returning();
     return created;
   }
-  // Piper Config
-  async getPiperConfig(userId: string): Promise<PiperConfig | undefined> {
-    const [config] = await db.select().from(piperConfig).where(eq(piperConfig.userId, userId));
-    return config || undefined;
-  }
-
-  async createPiperConfig(config: InsertPiperConfig): Promise<PiperConfig> {
-    const [newConfig] = await db.insert(piperConfig).values(config).returning();
-    return newConfig;
-  }
-
-  async updatePiperConfig(userId: string, config: Partial<InsertPiperConfig>): Promise<PiperConfig> {
-    const [updated] = await db.update(piperConfig)
-      .set({ ...config, updatedAt: new Date() })
-      .where(eq(piperConfig.userId, userId))
-      .returning();
-    return updated;
-  }
 }
 
 export const storage = new DatabaseStorage();