feat(init): add 'struct init' scaffolder (cherry-pick of 781d18d)

[httpdss]

Docs updated for the new struct init command in:

• docs/cli-reference.md (added init to overview and detailed section)
• docs/usage.md (new section with examples and explanation)
• docs/quickstart.md (bootstrap section showing struct init)

Refs: #97

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.59%. Comparing base (77c4f43) to head (cf932e3).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
struct_module/main.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #108      +/-   ##
==========================================
+ Coverage   66.14%   66.59%   +0.45%     
==========================================
  Files          19       20       +1     
  Lines        1335     1359      +24     
  Branches      229      230       +1     
==========================================
+ Hits          883      905      +22     
- Misses        385      387       +2     
  Partials       67       67              

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