fix: request generation no longer insert before preview

[Dao-Ho]

title

Request generation endpoint simply generates the request object and returns to FE for user to edit/preview before inserting rather than immediately inserting the request upon generation

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 19.66%. Comparing base (87ced32) to head (98b5796).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##            main     #286       +/-   ##
==========================================
+ Coverage   0.62%   19.66%   +19.04%     
==========================================
  Files         78       46       -32     
  Lines       3218     2253      -965     
==========================================
+ Hits          20      443      +423     
+ Misses      3198     1796     -1402     
- Partials       0       14       +14     

Flag	Coverage Δ
backend	19.66% <100.00%> (?)
web	?

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Files with missing lines	Coverage Δ
backend/internal/handler/requests.go	81.56% <100.00%> (ø)

... and 123 files with indirect coverage changes

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