Use typed configuration properties

[havlli]

Summary: replace scattered string-based configuration injection with typed validated properties and move cache host and port to native application settings.

Verification: focused configuration tests passed; full project verification passed.

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.8%. Comparing base (5f0feca) to head (b3e94b6).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #19     +/-   ##
=========================================
+ Coverage     98.8%   98.8%   +0.1%     
+ Complexity     848     847      -1     
=========================================
  Files          103     104      +1     
  Lines         2201    2204      +3     
  Branches        65      65             
=========================================
+ Hits          2174    2177      +3     
  Misses          27      27             

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