MAJOR: Complete Architectural Cleanup - Remove All Deprecated Modules

Phase 2: Code Cleanup + Java 17 LTS Target

Code Cleanup - Removed Duplicate & Obsolete Classes:
✅ PlantUML Generators: Removed duplicates from codegen-base
  - Kept correct versions in codegen-plantuml module per OSGi exports
✅ Obsolete Key Classes: Removed entire core/test/relation/ package
  - Legacy ValidationChain/TypeConfig system remnants (11 files)
  - No active references found, constraint system replaced these
✅ Web Controller Duplicates: Consolidated to com.draagon.meta.web.spring.api
  - Removed react-specific package duplicates
  - Updated OSGi exports in web-spring/pom.xml
✅ Fruit Test Classes: Preserved (serve distinct testing purposes)
  - core: Full POJO implementations
  - metadata: MetaObject proxy wrappers + interfaces

Java 17 LTS Configuration:
✅ Updated parent POM java.version: 21 → 17
✅ Updated Maven enforcer requirement: [21,) → [17,)
✅ All modules now target Java 17 LTS for better compatibility
✅ Build & tests verified working with Java 17

Build Status:
✅ All 19 modules compile successfully
✅ All tests pass (constraint system: 8/8, registry: 7/7, vehicle: 6/6)
✅ No breaking changes introduced
✅ OSGi bundle configurations updated correctly

Architectural Impact:
- Removed 17 duplicate/obsolete files
- Improved module separation and clarity
- Enhanced compatibility with Java 17 LTS
- Maintained all functionality and test coverage

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

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

Author: dmealing