feat: Go backend, enhanced search, new widgets, Docker deploy

Major changes:
- Add Go backend (backend/) with microservices architecture
- Enhanced master-agents-svc: reranker, content-classifier, stealth-crawler,
  proxy-manager, media-search, fastClassifier, language detection
- New web-svc widgets: KnowledgeCard, ProductCard, ProfileCard, VideoCard,
  UnifiedCard, CardGallery, InlineImageGallery, SourcesPanel, RelatedQuestions
- Improved discover-svc with discover-db integration
- Docker deployment improvements (Caddyfile, vendor.sh, BUILD.md)
- Library-svc: project_id schema migration
- Remove deprecated finance-svc and travel-svc
- Localization improvements across services

Made-with: Cursor

services/suggestions-svc/package.json

@@ -13,6 +13,7 @@
     "@fastify/cors": "^9.0.1",
     "@toolsycc/json-repair": "^0.1.22",
     "fastify": "^4.28.1",
+    "franc": "^6.2.0",
     "ollama": "^0.6.3",
     "openai": "^6.9.0",
     "zod": "^4.1.12"

services/suggestions-svc/src/lib/agents/suggestions.ts

@@ -6,6 +6,13 @@ import type { ChatTurnMessage } from '../types.js';
 
 type Input = { chatHistory: ChatTurnMessage[]; locale?: string };
 
+function getLastUserContent(history: ChatTurnMessage[]): string {
+  for (let i = history.length - 1; i >= 0; i--) {
+    if (history[i].role === 'user') return history[i].content ?? '';
+  }
+  return '';
+}
+
 export async function generateSuggestions(input: Input, llm: BaseLLM): Promise<string[]> {
   const schema = z.object({
     suggestions: z.array(z.string()).describe('List of suggested questions or prompts'),
@@ -14,7 +21,7 @@ export async function generateSuggestions(input: Input, llm: BaseLLM): Promise<s
   const res = await llm.generateObject<{ suggestions: string[] }>({
     schema,
     messages: [
-      { role: 'system', content: getSuggestionGeneratorPrompt(input.locale) },
+      { role: 'system', content: getSuggestionGeneratorPrompt(undefined, undefined) },
       {
         role: 'user',
         content: `<chat_history>\n${formatChatHistoryAsString(input.chatHistory)}\n</chat_history>`,

services/suggestions-svc/src/lib/prompts/detectLanguage.ts

@@ -0,0 +1,29 @@
+import { franc } from 'franc';
+
+/** ISO 639-3 (franc) → human-readable language name */
+const ISO6393_TO_LANGUAGE: Record<string, string> = {
+  rus: 'Russian', eng: 'English', deu: 'German', fra: 'French', spa: 'Spanish',
+  ita: 'Italian', por: 'Portuguese', ukr: 'Ukrainian', pol: 'Polish', cmn: 'Chinese',
+  jpn: 'Japanese', kor: 'Korean', arb: 'Arabic', tur: 'Turkish', bel: 'Belarusian',
+  kaz: 'Kazakh', swe: 'Swedish', nob: 'Norwegian', dan: 'Danish', fin: 'Finnish',
+  ces: 'Czech', slk: 'Slovak', hun: 'Hungarian', ron: 'Romanian', bul: 'Bulgarian',
+  hrv: 'Croatian', srp: 'Serbian', ell: 'Greek', hin: 'Hindi', tha: 'Thai',
+  vie: 'Vietnamese', ind: 'Indonesian', zlm: 'Malay', heb: 'Hebrew', pes: 'Persian',
+  nld: 'Dutch',
+};
+
+/** Fallback instruction when language cannot be determined */
+export const FALLBACK_RESPONSE_LANGUAGE = `
+<response_language>
+Always respond in the same language as the user's query. Detect the language from the conversation and reply accordingly. If the user wrote in Russian, respond in Russian; if in English, respond in English; and so on.
+</response_language>`;
+
+/**
+ * Detect language of text using franc. Returns human-readable language name or undefined if undetermined.
+ */
+export function detectLanguage(text: string): string | undefined {
+  if (!text || text.trim().length < 2) return undefined;
+  const code = franc(text.trim(), { minLength: 2 });
+  if (code === 'und') return undefined;
+  return ISO6393_TO_LANGUAGE[code] ?? code;
+}

services/suggestions-svc/src/lib/prompts/locale.ts

@@ -1,21 +1,17 @@
-const LOCALE_TO_LANGUAGE: Record<string, string> = {
-  ru: 'Russian',
-  en: 'English',
-  de: 'German',
-  fr: 'French',
-  es: 'Spanish',
-  it: 'Italian',
-  pt: 'Portuguese',
-  uk: 'Ukrainian',
-  pl: 'Polish',
-  zh: 'Chinese',
-  ja: 'Japanese',
-  ko: 'Korean',
-};
+/** Принудительно русский язык везде */
+const RUSSIAN_RESPONSE_LANGUAGE = `
+<response_language>
+Always respond ONLY in Russian. Regardless of the user's query language, format your entire response in Russian.
+</response_language>`;
 
-export function getLocaleInstruction(locale?: string): string {
-  if (!locale) return '';
-  const lang = locale.split('-')[0];
-  const name = LOCALE_TO_LANGUAGE[lang] ?? lang;
-  return `\n<response_language>\nUser's locale is ${locale}. Always format your response in ${name}.\n</response_language>`;
+export const FALLBACK_RESPONSE_LANGUAGE = RUSSIAN_RESPONSE_LANGUAGE;
+
+/**
+ * Build response language instruction. Always Russian.
+ */
+export function getLocaleInstruction(
+  _locale?: string,
+  _detectedLanguage?: string,
+): string {
+  return RUSSIAN_RESPONSE_LANGUAGE;
 }

services/suggestions-svc/src/lib/prompts/suggestions.ts

@@ -12,6 +12,6 @@ Rules:
 Today's date is ${new Date().toISOString()}
 `;
 
-export function getSuggestionGeneratorPrompt(locale?: string): string {
-  return base + getLocaleInstruction(locale);
+export function getSuggestionGeneratorPrompt(locale?: string, detectedLanguage?: string): string {
+  return base + getLocaleInstruction(locale, detectedLanguage);
 }