fix : Tutorbot websocket resilience and CLI config parsing edge case

[srinivasrk]

Description

This PR hardens TutorBot and CLI behavior across three failure modes that surfaced in local UI usage on Windows:

• Prevents CLI crashes when --config-json is present but arrives as blank/whitespace by normalizing and treating it as {} before JSON parsing.
• Improves TutorBot WebSocket startup by auto-starting a configured bot when a chat socket connects and the bot is currently not running.
• Makes TutorBot WebSocket send/receive flow resilient to client disconnects so normal browser/tab closure does not cascade into noisy secondary exceptions.
• Guards route param handling in the bot chat UI so botId is normalized safely and no API/WS calls are attempted with undefined.

Regression coverage was added for CLI parsing, TutorBot WS startup behavior, and web route-param normalization.

Related Issues

• Closes #...
• Related to #...

Module(s) Affected

• agents
• api
• config
• core
• knowledge
• logging
• services
• tools
• utils
• web (Frontend)
• docs (Documentation)
• scripts
• tests
• Other: cli

Checklist

• I have read and followed the contribution guidelines.
• My code follows the project's coding standards.
• I have run pre-commit run --all-files and fixed any issues.
• I have added relevant tests for my changes.
• I have updated the documentation (if necessary).
• My changes do not introduce any new security vulnerabilities.

Additional Notes

Tests run locally:

• uv run pytest tests/cli/test_common.py tests/api/test_tutorbot_router.py
• node --test "web/tests/route-params.test.ts"

Key files touched:

• deeptutor_cli/common.py
• deeptutor/api/routers/tutorbot.py
• web/app/(workspace)/agents/[botId]/chat/page.tsx
• web/lib/route-params.ts
• tests/cli/test_common.py
• tests/api/test_tutorbot_router.py
• web/tests/route-params.test.ts