Merge branch 'fix/typescript-compilation-errors' into main

Major repository cleanup and critical bug fixes:

1. SSH Key Validation (CRITICAL SECURITY FIX)
   - Fixed bug where hosts.py imported but never called validate_ssh_key()
   - Created /api/hosts/validate-credentials endpoint
   - Added validation to host create/update operations
   - 15 comprehensive regression tests added

2. Script Cleanup (71% reduction)
   - Removed 52 obsolete debug/build/test scripts
   - Kept 21 essential production scripts
   - Improved repository clarity and maintainability

3. Markdown Organization (80% reduction in root)
   - Moved 7 technical docs to docs/ directory
   - Removed 5 obsolete status/analysis files
   - Root now contains only: README.md, CONTRIBUTING.md, PLUGIN_SDK.md
   - Follows GitHub best practices

4. Security Fixes
   - Fixed 3 Dependabot vulnerabilities (puppeteer CVE, requests library)
   - SSH validation now enforced in backend

5. Data Loss Prevention
   - Changed stop-openwatch.sh default to preserve data
   - Fixed data persistence issues

6. TypeScript Compilation Fixes
   - Resolved compilation errors blocking builds
   - Fixed Redux integration issues
   - Improved type safety

7. Documentation Improvements
   - Simplified README (216 lines vs 300+ lines)
   - Created comprehensive cleanup assessments
   - Updated deployment and testing documentation

Commits included:
- 2f9de8c Organize markdown files
- 3cd12fc Clean up repository scripts
- 0607d4a Add SSH key validation tests
- 4bbe7c8 Fix SSH key validation
- 933c406 Fix data loss issue
- 3c67213 Fix security vulnerabilities
- db00aab Add testing infrastructure
- e84d652 Fix first-run success
- 050e447 Fix TypeScript compilation

Impact: Zero production impact, significant improvements to code quality,
security, and developer experience.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: remyluslosius