refactor(generators): use file processor chain pattern for dogfooding

[deepracticexs]

Summary

Implements #16 - Refactors generators to use NodeSpec's own files as templates instead of hardcoded configuration strings, following the "eat your own dog food" principle.

Architecture

File-Level Building Blocks

• BaseGenerator: Abstract base class with file processor chain
• FileProcessor Interface: Atomic file-level processing with canProcess() and process()
• Explicit File Mappings: Generators declare which files they need (whitelist approach)

Processors Implemented

• PackageJsonProcessor: Handles package.json with field merging strategy
• AppPackageJsonProcessor: Handles app package.json with bin field configuration
• TsConfigProcessor: Handles JSONC (JSON with Comments) format
• TypeScriptProcessor: Direct copy of .ts files
• MarkdownProcessor: Direct copy of .md files

Key Design Decisions

1. No Priority System: Each processor uses atomic matching on file names
2. No Directory Scanning: Explicit file mappings, no need for exclude lists
3. Preserves Comments: TsConfigProcessor uses direct file copy to preserve JSONC comments
4. Extensible: Easy to add new file types by creating new processors

Benefits

✅ Single Source of Truth: Uses NodeSpec's actual files as templates
✅ No Hardcoded Configs: Eliminated 100+ lines of hardcoded configuration strings
✅ Automatic Sync: Template changes automatically apply to generated projects
✅ File-Level Control: Precise control over which files are used
✅ Extensible: Simple to add support for new file types

Code Reduction

• PackageGenerator: 120 lines → 46 lines (-61%)
• AppGenerator: 153 lines → 67 lines (-56%)

Testing

✅ Package generation with template source
✅ App generation with CLI source
✅ JSONC support (tsconfig.json with comments)
✅ Configuration inheritance (scripts, dependencies, exports)
✅ All hooks passed: format, lint, typecheck, commitlint

Template Source Mapping

Generator	Template Source	Files Used
PackageGenerator	packages/template/	package.json, tsconfig.json, tsup.config.ts, src/index.ts
AppGenerator	apps/cli/	package.json, tsconfig.json, tsup.config.ts, src/index.ts, src/cli.ts

Future Work

• Handle template embedding for CLI distribution (getNodeSpecRoot runtime detection)
• Add support for more file types as needed
• Refactor ServiceGenerator and ProjectGenerator to use same pattern

Closes #16