fix: transform raw inventory data and improve inventory validation

[seer-by-sentry]

👋 Hi there! This PR was automatically generated by Autofix 🤖

This fix was triggered by Jenn Mueng

Fixes FLASK-1Q

• Transforms raw inventory data from the database into a dictionary format for easier access.
• Improves inventory validation by using an inventory map for efficient lookup and providing more informative error messages.
• Handles cases where a product is not found in the inventory during validation.
• Converts quantity from string to integer before validation.

If you have any questions or feedback for the Sentry team about this fix, please email autofix@sentry.io with the Run ID: 14087.

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[sentry]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: flask/src/db.py

Function	Unhandled Issue
get_inventory	DatabaseConnectionError: get_inventory checkout Event Count: 79

📄 File: flask/src/main.py (Click to Expand)

Function	Unhandled Issue
checkout	Exception: Not enough inventory for product checkout Event Count: 4.6k
checkout	DatabaseConnectionError: get_inventory checkout Event Count: 79

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.

Project coverage is 31.91%. Comparing base (4e185bd) to head (620d32b).
Report is 50 commits behind head on master.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
flask/src/main.py	0.00%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #759      +/-   ##
==========================================
+ Coverage   28.55%   31.91%   +3.35%     
==========================================
  Files          40       39       -1     
  Lines         998      893     -105     
  Branches      114      114              
==========================================
  Hits          285      285              
+ Misses        695      590     -105     
  Partials       18       18              

Flag	Coverage Δ
api	7.90% <0.00%> (+1.91%)	⬆️
frontend	45.92% <ø> (ø)

Components	Coverage Δ
checkout_module	7.90% <0.00%> (+1.91%)	⬆️
product_component	42.08% <ø> (ø)

Files with missing lines	Coverage Δ
flask/src/main.py	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes