feat: add Minimax Speech as alternative TTS provider for Reels

- Add minimax_config table (migration + schema + storage CRUD)
- Add GET/POST /api/minimax/config routes
- Pass tts_provider + minimax_api_key through ffmpeg service
- Add generate_tts_minimax() in Python using Minimax T2A v2 API
- Fall back to ffsubsync for subtitle sync (no WordBoundary events)
- Add Minimax config card in Settings page
- Add provider toggle (Edge TTS / Minimax) + French voices in new-reel

server/services/ffmpeg.ts

@@ -13,6 +13,8 @@ interface FFmpegReelRequest {
     music_url?: string;         // OU URL directe de la musique
     tts_enabled?: boolean;      // Activation du TTS
     tts_voice?: string;         // Voix TTS (ex: fr-FR-VivienneNeural)
+    tts_provider?: string;      // Provider TTS: "edge_tts" (défaut) ou "minimax"
+    minimax_api_key?: string;   // Clé API Minimax (requis si tts_provider=minimax)
     word_duration?: number;     // Durée par mot (default: 0.6s)
     font_size?: number;         // Taille police (default: 24)
     music_volume?: number;      // Volume musique (default: 0.25)
@@ -71,6 +73,8 @@ export class FFmpegService {
             musicUrl?: string;
             ttsEnabled?: boolean;
             ttsVoice?: string;
+            ttsProvider?: string;
+            minimaxApiKey?: string;
             wordDuration?: number;
             fontSize?: number;
             musicVolume?: number;
@@ -90,6 +94,8 @@ export class FFmpegService {
             music_url: options.musicUrl,
             tts_enabled: options.ttsEnabled,
             tts_voice: options.ttsVoice,
+            tts_provider: options.ttsProvider,
+            minimax_api_key: options.minimaxApiKey,
             word_duration: options.wordDuration ?? 0.6,
             font_size: options.fontSize ?? 64,
             music_volume: options.musicVolume ?? 0.25,
@@ -172,6 +178,8 @@ export class FFmpegService {
             musicUrl?: string;
             ttsEnabled?: boolean;
             ttsVoice?: string;
+            ttsProvider?: string;
+            minimaxApiKey?: string;
             wordDuration?: number;
             fontSize?: number;
             musicVolume?: number;
@@ -191,6 +199,8 @@ export class FFmpegService {
             music_url: options.musicUrl,
             tts_enabled: options.ttsEnabled,
             tts_voice: options.ttsVoice,
+            tts_provider: options.ttsProvider,
+            minimax_api_key: options.minimaxApiKey,
             word_duration: options.wordDuration ?? 0.6,
             font_size: options.fontSize ?? 64,
             music_volume: options.musicVolume ?? 0.25,
@@ -285,7 +295,9 @@ export class FFmpegService {
     }
     async previewTTS(
         text: string,
-        voice: string
+        voice: string,
+        ttsProvider?: string,
+        minimaxApiKey?: string
     ): Promise<{ success: boolean; audioBase64?: string; error?: string }> {
         const config = this.ensureConfigured();
 
@@ -298,7 +310,9 @@ export class FFmpegService {
                 },
                 body: JSON.stringify({
                     text,
-                    tts_voice: voice
+                    tts_voice: voice,
+                    tts_provider: ttsProvider,
+                    minimax_api_key: minimaxApiKey,
                 }),
             });