cp/enhancement: Implement module registry - Pass 1 of 3-pass algorithm

[shivasurya]

Implement the first pass of the call graph construction algorithm: building a complete registry of Python modules by walking the directory tree.

• BuildModuleRegistry: Walks directory tree and maps file paths to module paths
• convertToModulePath: Converts file system paths to Python import paths
• shouldSkipDirectory: Filters out venv, pycache, build dirs, etc.

Module Path Conversion:

• Handles regular files: myapp/views.py → myapp.views
• Handles packages: myapp/utils/init.py → myapp.utils
• Supports deep nesting: myapp/api/v1/endpoints/users.py → myapp.api.v1.endpoints.users
• Cross-platform: Normalizes Windows/Unix path separators

Checklist:

• Tests passing (gradle testGo)?
• Lint passing (golangci-lint run this requires golangci-lint)?

[safedep]

SafeDep Report Summary

No dependency changes detected. Nothing to scan.

_{This report is generated by SafeDep Github App}

[codecov]

Codecov Report

❌ Patch coverage is 76.19048% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.65%. Comparing base (69ad493) to head (ab9f7e1).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sourcecode-parser/graph/callgraph/registry.go	76.19%	5 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #323      +/-   ##
==========================================
+ Coverage   73.61%   73.65%   +0.04%     
==========================================
  Files          24       25       +1     
  Lines        2573     2615      +42     
==========================================
+ Hits         1894     1926      +32     
- Misses        638      643       +5     
- Partials       41       46       +5     

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