feat: add webui

[zx06]

No description provided.

[sonarqubecloud]

Quality Gate failed

Failed conditions
3 Security Hotspots

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 47.31544% with 471 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.74%. Comparing base (77bacda) to head (895349b).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
internal/web/handler.go	44.44%	137 Missing and 23 partials ⚠️
internal/app/service.go	0.00%	145 Missing ⚠️
cmd/xsql/web.go	32.23%	78 Missing and 4 partials ⚠️
internal/db/pg/schema.go	79.67%	15 Missing and 10 partials ⚠️
internal/db/mysql/schema.go	79.46%	16 Missing and 7 partials ⚠️
internal/web/server.go	0.00%	22 Missing ⚠️
internal/db/schema.go	80.55%	4 Missing and 3 partials ⚠️
webui/embed.go	0.00%	5 Missing ⚠️
internal/output/writer.go	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
- Coverage   81.53%   73.74%   -7.79%     
==========================================
  Files          41       46       +5     
  Lines        2978     3679     +701     
==========================================
+ Hits         2428     2713     +285     
- Misses        419      802     +383     
- Partials      131      164      +33     

Flag	Coverage Δ
e2e	47.02% <75.17%> (+3.03%)	⬆️
integration	47.02% <75.17%> (+3.03%)	⬆️
unittests	61.97% <26.39%> (-7.94%)	⬇️

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