feat(dsn): add multi-language DSN detection

[betegon]

Summary

Extends DSN auto-detection to support 6 programming languages, not just JavaScript/TypeScript.

Changes

• New LanguageDetector interface - Common type for all language-specific detectors
• Unified scanner - Single glob scan dispatching to correct extractor by extension
• 6 language detectors:
  • JavaScript/TypeScript (refactored to implement interface)
  • Python (sentry_sdk.init, SENTRY_DSN settings)
  • PHP (Sentry\init, DSN in config arrays)
  • Ruby (Sentry.init blocks, config.dsn)
  • Go (sentry.Init, sentry.ClientOptions)
  • Java/Kotlin (Sentry.init, setDsn, sentry.properties)
• Comprehensive tests - 111 new test cases covering all languages

Architecture

src/lib/dsn/languages/
├── types.ts          # LanguageDetector interface
├── index.ts          # Registry + unified scanner
├── javascript.ts     # JS/TS detector
├── python.ts         # Python detector
├── php.ts            # PHP detector
├── ruby.ts           # Ruby detector
├── go.ts             # Go detector
└── java.ts           # Java/Kotlin detector

Each detector specifies:

• name: Display name
• extensions: File extensions to scan
• skipDirs: Directories to ignore (e.g., node_modules, vendor)
• extractDsn: Function to extract DSN from file content

Test Results

205 pass, 0 fail
281 expect() calls
14 test files