🩹 fix(bot-services): export LOGIN_MESSAGES and auth error helpers

Export the following from @manacore/bot-services:
- LOGIN_MESSAGES: Pre-defined auth error messages for all bot types
- AUTH_ERROR_MESSAGES: Same as LOGIN_MESSAGES (preferred name)
- formatAuthErrorMessage(): Helper to create custom auth error messages

These are used by bots to show consistent error messages when token
refresh fails and the user needs to re-authenticate.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

services/matrix-tts-bot/src/config/configuration.ts

@@ -9,7 +9,7 @@ export default () => ({
 	tts: {
 		url: process.env.TTS_URL || 'http://localhost:3022',
 		apiKey: process.env.TTS_API_KEY || '',
-		defaultVoice: process.env.DEFAULT_VOICE || 'af_heart',
+		defaultVoice: process.env.DEFAULT_VOICE || 'de_thorsten',
 		defaultSpeed: parseFloat(process.env.DEFAULT_SPEED || '1.0'),
 		maxTextLength: parseInt(process.env.MAX_TEXT_LENGTH || '500', 10),
 	},
@@ -20,19 +20,26 @@ export const HELP_TEXT = `**TTS Bot - Hilfe**
 Ich wandle deine Textnachrichten in Sprache um!
 
 **Befehle:**
-- \`!voice [name]\` - Stimme wechseln (z.B. \`!voice bm_daniel\`)
-- \`!voices\` - Alle verfugbaren Stimmen anzeigen
-- \`!speed [0.5-2.0]\` - Geschwindigkeit andern
+- \`!voice [name]\` - Stimme wechseln (z.B. \`!voice de_thorsten\`)
+- \`!voices\` - Alle verfügbaren Stimmen anzeigen
+- \`!speed [0.5-2.0]\` - Geschwindigkeit ändern
 - \`!status\` - Aktuelle Einstellungen
 - \`!help\` - Diese Hilfe
 
 **Verwendung:**
-Schreibe einfach eine Nachricht und ich sende dir die Sprachausgabe zuruck.
+Schreibe einfach eine Nachricht und ich sende dir die Sprachausgabe zurück.
+Die Sprache wird automatisch erkannt (Deutsch/Englisch).
 
-**Beispiel-Stimmen:**
+**Deutsche Stimmen:**
+- \`de_thorsten\` - Deutsch männlich (lokal)
+- \`de_katja\` - Deutsch weiblich
+- \`de_conrad\` - Deutsch männlich
+- \`de_florian\` - Deutsch männlich jung
+
+**Englische Stimmen:**
 - \`af_heart\` - Amerikanisch weiblich (warm)
-- \`bm_daniel\` - Britisch mannlich (klassisch)
-- \`am_michael\` - Amerikanisch mannlich`;
+- \`bm_daniel\` - Britisch männlich
+- \`am_michael\` - Amerikanisch männlich`;
 
 export const WELCOME_TEXT = `**TTS Bot**
 

services/matrix-tts-bot/src/tts/tts.service.ts

@@ -13,6 +13,73 @@ export interface VoicesResponse {
 	custom_voices: VoiceInfo[];
 }
 
+// German voice mapping
+const GERMAN_VOICES: Record<string, string> = {
+	de_thorsten: 'de_thorsten', // Local Piper
+	de_katja: 'de_katja', // Edge TTS female
+	de_conrad: 'de_conrad', // Edge TTS male
+	de_amala: 'de_amala', // Edge TTS female young
+	de_florian: 'de_florian', // Edge TTS male young
+};
+
+const DEFAULT_GERMAN_VOICE = 'de_thorsten';
+
+// Common German words for language detection
+const GERMAN_INDICATORS = [
+	'ich',
+	'du',
+	'er',
+	'sie',
+	'wir',
+	'ihr',
+	'und',
+	'oder',
+	'aber',
+	'wenn',
+	'dass',
+	'ist',
+	'sind',
+	'war',
+	'haben',
+	'werden',
+	'kann',
+	'muss',
+	'soll',
+	'will',
+	'nicht',
+	'auch',
+	'noch',
+	'schon',
+	'sehr',
+	'nur',
+	'mehr',
+	'hier',
+	'jetzt',
+	'heute',
+	'morgen',
+	'gestern',
+	'bitte',
+	'danke',
+	'hallo',
+	'guten',
+	'tag',
+	'abend',
+	'nacht',
+	'wie',
+	'was',
+	'wer',
+	'wo',
+	'wann',
+	'warum',
+	'welche',
+	'diese',
+	'keine',
+	'eine',
+	'einen',
+	'einem',
+	'einer',
+];
+
 @Injectable()
 export class TtsService {
 	private readonly logger = new Logger(TtsService.name);
@@ -25,13 +92,65 @@ export class TtsService {
 	}
 
 	/**
-	 * Synthesize text to speech using Kokoro model
+	 * Detect if text is likely German
+	 */
+	private isGerman(text: string): boolean {
+		const lowerText = text.toLowerCase();
+
+		// Check for German-specific characters
+		if (/[äöüß]/.test(lowerText)) {
+			return true;
+		}
+
+		// Check for common German words
+		const words = lowerText.split(/\s+/);
+		const germanWordCount = words.filter((word) =>
+			GERMAN_INDICATORS.includes(word.replace(/[.,!?;:'"]/g, ''))
+		).length;
+
+		// If more than 20% of words are German indicators, consider it German
+		return germanWordCount / words.length > 0.2;
+	}
+
+	/**
+	 * Check if voice is a German voice
+	 */
+	private isGermanVoice(voice: string): boolean {
+		return voice.startsWith('de_');
+	}
+
+	/**
+	 * Synthesize text to speech - auto-detects language
 	 */
 	async synthesize(text: string, voice: string = 'af_heart', speed: number = 1.0): Promise<Buffer> {
+		// Auto-detect language if using English voice but text is German
+		const textIsGerman = this.isGerman(text);
+		const voiceIsGerman = this.isGermanVoice(voice);
+
+		if (textIsGerman && !voiceIsGerman) {
+			this.logger.debug(`German text detected, switching to German voice`);
+			return this.synthesizeGerman(text, DEFAULT_GERMAN_VOICE, speed);
+		}
+
+		if (voiceIsGerman) {
+			return this.synthesizeGerman(text, voice, speed);
+		}
+
+		return this.synthesizeKokoro(text, voice, speed);
+	}
+
+	/**
+	 * Synthesize using Kokoro (English voices)
+	 */
+	private async synthesizeKokoro(
+		text: string,
+		voice: string = 'af_heart',
+		speed: number = 1.0
+	): Promise<Buffer> {
 		const url = `${this.ttsUrl}/synthesize/kokoro`;
 
 		this.logger.debug(
-			`Synthesizing: "${text.substring(0, 50)}..." with voice=${voice}, speed=${speed}`
+			`Kokoro synthesizing: "${text.substring(0, 50)}..." with voice=${voice}, speed=${speed}`
 		);
 
 		const headers: Record<string, string> = { 'Content-Type': 'application/json' };
@@ -52,7 +171,7 @@ export class TtsService {
 
 		if (!response.ok) {
 			const errorText = await response.text();
-			this.logger.error(`TTS failed: ${response.status} - ${errorText}`);
+			this.logger.error(`Kokoro TTS failed: ${response.status} - ${errorText}`);
 			throw new Error(`TTS synthesis failed: ${response.status}`);
 		}
 
@@ -62,6 +181,54 @@ export class TtsService {
 		return Buffer.from(arrayBuffer);
 	}
 
+	/**
+	 * Synthesize using Piper (German voices)
+	 */
+	private async synthesizeGerman(
+		text: string,
+		voice: string = DEFAULT_GERMAN_VOICE,
+		speed: number = 1.0
+	): Promise<Buffer> {
+		const url = `${this.ttsUrl}/synthesize/piper`;
+
+		// Map voice to valid German voice
+		const germanVoice = GERMAN_VOICES[voice] || DEFAULT_GERMAN_VOICE;
+
+		// Piper uses length_scale (inverse of speed)
+		const lengthScale = 1.0 / speed;
+
+		this.logger.debug(
+			`Piper synthesizing: "${text.substring(0, 50)}..." with voice=${germanVoice}, lengthScale=${lengthScale}`
+		);
+
+		const headers: Record<string, string> = { 'Content-Type': 'application/json' };
+		if (this.apiKey) {
+			headers['X-API-Key'] = this.apiKey;
+		}
+
+		const response = await fetch(url, {
+			method: 'POST',
+			headers,
+			body: JSON.stringify({
+				text,
+				voice: germanVoice,
+				length_scale: lengthScale,
+				output_format: 'wav',
+			}),
+		});
+
+		if (!response.ok) {
+			const errorText = await response.text();
+			this.logger.error(`Piper TTS failed: ${response.status} - ${errorText}`);
+			throw new Error(`TTS synthesis failed: ${response.status}`);
+		}
+
+		const arrayBuffer = await response.arrayBuffer();
+		this.logger.debug(`Received German audio: ${arrayBuffer.byteLength} bytes`);
+
+		return Buffer.from(arrayBuffer);
+	}
+
 	/**
 	 * Get list of available voices
 	 */