feat(agent-office): scaffold backend — config, db, models, Dockerfile

SQLite DB layer with WAL mode, agent_config/tasks/logs/telegram_state tables,
2 seeded agents, full CRUD, and passing test suite (7/7).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

agent-office/app/config.py

@@ -0,0 +1,23 @@
+import os
+
+# Service URLs (Docker internal network)
+STOCK_LAB_URL = os.getenv("STOCK_LAB_URL", "http://localhost:18500")
+MUSIC_LAB_URL = os.getenv("MUSIC_LAB_URL", "http://localhost:18600")
+
+# Telegram
+TELEGRAM_BOT_TOKEN = os.getenv("TELEGRAM_BOT_TOKEN", "")
+TELEGRAM_CHAT_ID = os.getenv("TELEGRAM_CHAT_ID", "")
+TELEGRAM_WEBHOOK_URL = os.getenv("TELEGRAM_WEBHOOK_URL", "")
+
+# Database
+DB_PATH = os.getenv("AGENT_OFFICE_DB_PATH", "/app/data/agent_office.db")
+
+# CORS
+CORS_ALLOW_ORIGINS = os.getenv(
+    "CORS_ALLOW_ORIGINS", "http://localhost:3007,http://localhost:8080"
+)
+
+# Idle break threshold (seconds)
+IDLE_BREAK_THRESHOLD = int(os.getenv("IDLE_BREAK_THRESHOLD", "300"))  # 5 min
+BREAK_DURATION_MIN = int(os.getenv("BREAK_DURATION_MIN", "60"))       # 1 min
+BREAK_DURATION_MAX = int(os.getenv("BREAK_DURATION_MAX", "180"))      # 3 min