Fix failing tests, security vulnerabilities, and enhance admin UI validation

[Copilot]

This PR addresses the top 5 critical issues identified in the NearTRIP project to improve reliability, security, and user experience.

Issues Fixed

1. Failing Test Suite

Fixed multiple test failures that were blocking CI:

• GPS test: Corrected expected closest station calculation (Station2 is actually 2m closer than Station1 to test coordinates)
• NTRIP test: Resolved variable scoping issues in socket connection mocking by using proper this context binding
• All 16 tests now pass consistently

2. File System Cleanup

Removed duplicate .gitingore file (typo) that was causing confusion. Only the correct .gitignore file remains.

3. Security Vulnerabilities

Updated 3 vulnerable dependencies using npm audit fix:

• Fixed brace-expansion Regular Expression DoS vulnerability
• Fixed on-headers HTTP response header manipulation vulnerability in morgan
• Zero vulnerabilities remaining after fixes

4. Configuration and Documentation

Enhanced project documentation and configuration consistency:

• README: Fixed admin port documentation (corrected from 2101 to 3000)
• Sample config: Added missing admin configuration fields (adminPort, adminUsername, adminPassword)
• Station config: Added missing active field to examples
• JSDoc: Improved module documentation in constants file

5. Enhanced Input Validation

Implemented comprehensive validation for the admin interface:

Client-side validation:

• Mount point format validation (letters, numbers, hyphens, underscores only)
• Hostname/IP address format validation for caster hosts
• Port range validation (1-65535)
• Coordinate bounds validation (latitude: -90 to 90, longitude: -180 to 180)
• Custom styled alert system replacing basic browser alerts

Server-side validation:

• Comprehensive API endpoint validation with detailed error messages
• Input sanitization (trimming whitespace)
• Duplicate mount point detection
• Proper HTTP status codes for different error types

Example validation in action:

# Valid station creation
curl -X POST -d '{"mountPoint":"TEST", "casterHost":"test.com", "casterPort":2101, "latitude":37.0, "longitude":-122.0}' /api/stations
# Returns: 201 Created

# Invalid data validation
curl -X POST -d '{"mountPoint":"INVALID HOST!", "casterPort":99999, "latitude":91.0}' /api/stations  
# Returns: 400 Bad Request with detailed error message

Testing

• All existing tests pass (16/16)
• Manual testing confirms API validation works correctly
• Admin interface displays user-friendly error messages
• Server starts successfully with updated configuration

Breaking Changes

None. All changes are backward compatible and enhance existing functionality without removing features.

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