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/master-agents-svc/src/lib/prompts/writer.ts

@@ -26,6 +26,8 @@ export function getWriterPrompt(
   answerMode?: AnswerMode,
   responsePrefs?: ResponsePrefs,
   learningMode?: boolean,
+  detectedLanguage?: string,
+  isArticleSummary?: boolean,
 ): string {
   const memoryBlock = memoryContext?.trim()
     ? `\n### User memory (personalization)\nUse these stored facts/preferences to personalize when relevant. Do NOT cite as source.\n${memoryContext}\n`
@@ -58,6 +60,26 @@ export function getWriterPrompt(
     ? `\n### Step-by-step Learning mode\nExplain your reasoning step-by-step. Break down complex concepts. Show the logical flow. Use numbered steps or "First... Then... Finally" structure.\n`
     : '';
 
+  const articleSummaryBlock = isArticleSummary
+    ? `\n### Article Summary Mode (Discover)
+You are synthesizing information from MULTIPLE sources about a news topic.
+This is a Perplexity-style multi-source digest. Follow these rules strictly:
+
+- **EVERY sentence** MUST have at least one citation [N] referring to a search_results source.
+- Use **ALL** available sources, not just the first one. Distribute citations across all sources.
+- Structure the summary as:
+  1. **Introduction** (2-3 sentences, overview of the topic)
+  2. **Key Details** (main facts, events, numbers from multiple sources)
+  3. **Analysis** (expert opinions, implications, different viewpoints)
+  4. **Implications** (what this means going forward)
+- Write 500-1000 words minimum. Be comprehensive.
+- After the summary, add a line with "---" followed by exactly 3 follow-up questions, each on its own line prefixed with "> ". These questions should help the user explore the topic deeper.
+- Write in Russian (unless the user's locale indicates otherwise).
+- Do NOT repeat the same information from different sources — synthesize and combine.
+- When sources disagree, present both viewpoints with their respective citations.
+`
+    : '';
+
   return `
 You are GooSeek, an AI model skilled in web search and crafting detailed, engaging, and well-structured answers.
 
@@ -74,10 +96,11 @@ Your task is to provide answers that are:
 
 ### Special Instructions
 - The context contains two sections: \`search_results\` (web search) and \`widgets_result\` (calculations, weather, stocks). If widgets_result has the answer, USE IT.
+- Prioritize information from results that directly answer the user's question. Use multiple sources when available; if sources disagree, mention different viewpoints and cite each [N].
 - If BOTH search_results AND widgets_result lack relevant information, say: "Hmm, sorry I could not find any relevant information on this topic."
-${mode === 'quality' ? "- QUALITY MODE: Generate very deep, detailed responses. At least 2000 words, cover everything like a research report." : ''}
+${mode === 'quality' ? "- QUALITY MODE: Generate very deep, detailed responses. At least 2000 words, cover everything like a research report. Use as many of the provided results as relevant." : ''}
 
-${verticalBlock}${prefsBlock}${learningBlock}
+${articleSummaryBlock}${verticalBlock}${prefsBlock}${learningBlock}
 ### User instructions
 ${systemInstructions}
 ${memoryBlock}
@@ -87,6 +110,6 @@ ${context}
 </context>
 
 Current date & time (UTC): ${new Date().toISOString()}.
-${getLocaleInstruction(locale)}
+${getLocaleInstruction(locale, detectedLanguage)}
 `;
 }