feat(search): message search for conversations and web console

[one-ea]

Summary

• ConversationService.searchMessagesInConversation — per-topic LIKE search with ESCAPE for % and _ wildcards
• ConversationService.searchMessages — global cross-conversation search with pagination, JOIN to contacts and telegram_topics
• /search <keyword> command in Topic — returns up to 20 matches with message previews
• /operations/search web page — search box + paginated results table (conversation, topic, contact, direction, text preview)
• Navigation header adds "搜索" tab

Problem

/history only showed the last 30 messages. There was no way to find a specific message by keyword across conversation history or globally. Ops had to SQL query the database to find past messages.

Verification

• npm run verify passed (check + 48 tests + audit 0 vulns)
• 3 new test cases: per-conversation search accuracy, global search with pagination, web search page HTML rendering

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Review details

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Run ID: f415ee6e-90ab-470a-86a6-b2cbc5a19efa

📥 Commits

Reviewing files that changed from the base of the PR and between 44b9689 and 406394d.

📒 Files selected for processing (5)

• src/channels/telegram/commands.ts
• src/domain/conversations.ts
• src/runtime/main.ts
• src/runtime/web-console.ts
• test/core.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 260629-feat-message-search

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