docs: chat import pipeline plan — link to Gitea issue #1

docs/chat-import-plan.md

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+# Chat Import Pipeline
+
+Plan and implementation details: https://git.produktor.io/eSlider/brain-chats-import/issues/1
+
+Progress tracked in that issue. This file kept as a local reference for agent sessions.
+
+## Key env vars (set in shell, never committed)
+
+TELEGRAM_MCP_DIR           telegram-mcp directory
+TELEGRAM_API_ID            from telegram.env (not committed)
+TELEGRAM_API_HASH          from telegram.env (not committed)
+TELEGRAM_PHONE             from telegram.env (not committed)
+TELEGRAM_SESSION_STRING    from telegram-mcp/.env (not committed)
+ONLYOFFICE_URL             from .env (not committed)
+ONLYOFFICE_USER            from .env (not committed)
+ONLYOFFICE_PASS            from .env (not committed)
+OO_CLI                     path to oo binary (default: $HOME/go/bin/oo)
+
+## Quick reference
+
+./bin/chat sync telegram --limit 100
+./bin/chat import
+./bin/chat index        # delegates to bin/kb/index
+./bin/chat facts
+./bin/chat apply --dry-run