feat(dora): add FileProvider with Serena-inspired file tools

[amondnet]

Summary

Added FileProvider with six file system operation tools inspired by Serena's file utilities. This simplifies the dora MCP server to use LSP and File providers, removing the JetBrains provider (TBD for future implementation).

Changes

• Add FileProvider with 6 tools:

  • read_file - Read files with line range support
  • create_text_file - Create or overwrite files
  • list_dir - List files and directories recursively
  • find_file - Find files matching patterns with wildcards
  • search_for_pattern - Search regex patterns across files with context
  • replace_content - Replace content using literal or regex mode

• Simplify server.ts - Use only LSP and File providers

• Remove JetBrains provider - Marked as TBD for future implementation

• Move tests - Reorganize from src/**/tests/ to test/ directory

• Update version - Bump to 0.2.0

Test Plan

• Verify FileProvider tools load correctly
• Test read_file with various line ranges
• Test create_text_file creates and overwrites files
• Test list_dir with recursive and ignore patterns
• Test find_file with wildcard patterns
• Test search_for_pattern with regex patterns
• Test replace_content in both literal and regex modes
• Verify test files moved to test/ directory
• Run full test suite with `bun run test`

Related Issues

Closes #TBD

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 40.14%. Comparing base (1fe9cab) to head (902370f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
+ Coverage   32.14%   40.14%   +8.00%     
==========================================
  Files          14       15       +1     
  Lines        2946     3340     +394     
==========================================
+ Hits          947     1341     +394     
  Misses       1999     1999              

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