Improve CLI messages and final summary; enhance MCP structure info (fixes #99)

[httpdss]

This PR addresses #99 by improving clarity and consistency of logs and user-facing messages, adding a final run summary, and enhancing the MCP server get_structure_info output.

Changes

• Standardize file operation messages across create/update/append/skip/backup/rename with emojis and clear paths.
• Add final summary counts for actions (created, updated, appended, skipped, backed up, renamed, folders) and dry-run counts when applicable.
• Improve get_structure_info to render folders and nested struct/with blocks cleanly rather than raw dicts.
• Keep all existing tests passing (107/107).

Acceptance criteria

• Output is consistent and easy to scan; final summary present.
• get_structure_info produces clean listings.
• No breaking changes to existing behavior, tests updated not required.

Screenshots/GIFs

• Docs update for screenshots can be handled separately if desired.

[codecov]

Codecov Report

❌ Patch coverage is 75.82418% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.67%. Comparing base (a60e222) to head (cda3f4f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
struct_module/mcp_server.py	57.89%	3 Missing and 5 partials ⚠️
struct_module/commands/generate.py	82.05%	4 Missing and 3 partials ⚠️
struct_module/file_item.py	78.78%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #109      +/-   ##
==========================================
+ Coverage   66.44%   70.67%   +4.22%     
==========================================
  Files          20       20              
  Lines        1359     1422      +63     
  Branches      230      251      +21     
==========================================
+ Hits          903     1005     +102     
+ Misses        388      343      -45     
- Partials       68       74       +6     

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[httpdss]

Added tests to cover the new standardized messages and final summary in GenerateCommand and improved formatting in MCP get_structure_info. All tests pass locally.

• tests/test_messages_and_summary.py: validates summary counts and append message, and checks rich rendering for folders/struct/with.
• Entire suite: passing.

Happy to add more coverage (backup/rename strategies, dry-run summary) if desired.