Edit Issue - .issue.db

Title *

Description

## Summary
Validated all app lifecycle APIs and provided complete UI development guide.

## Completed Work:
1. **API Validation**: Tested all 31 endpoints (14 registry + 17 tenant)
2. **Bug Fixed**: PATCH /api/v1/apps/{app_id} response validation (was returning incomplete fields)
3. **New Endpoint**: GET /api/v1/apps/{app_id}/versions/{version_id}/code - view source code
4. **Dead Code Removed**: Cache methods in executor.py that would crash if called
5. **Deprecated Endpoints**: /reload and /cache/clear now return informational NO-OP messages

## API Guide for UI:
See comments for complete endpoint list with methods, descriptions, and required permissions.

## Key Points:
- No caching - app code loads fresh from DB each execution
- To update app: PATCH /api/v1/apps/{app_id} with {display_name, description, category, tags, icon_url, etc}
- To view code: GET /api/v1/apps/{app_id}/versions/{version_id}/code
- Changes take effect immediately when new version created

use the following jwt in demo tenant to fetch responses and complete UI implementtion:

```
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJlbWFpbCI6ImZhcnNoZWVkLmFzaG91cmlAZ21haWwuY29tIiwidGVuYW50X2lkIjoiX3BsYXRmb3JtIiwiaWF0IjoxNzY1MzQ2NTQ2LCJleHAiOjE3NjU0MzI5NDZ9.TrzsCrVyztlGMzDvcmEsDCMIvMSCqeNleTQQFr8tEx0
```

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Edit Issue #337