fix(security): extricate hardcoded Gitea credentials, add centralized auth module
- Remove all hardcoded NW:eshkink0t credentials from 9 files across skills, commands, rules, and specs
- Add .kilo/shared/gitea-auth.md with get_gitea_token() and .kilo/gitea.jsonc config structure
- All Gitea API callers now use env vars (GITEA_TOKEN → GITEA_USER+GITEA_PASS → ValueError)
- Fix task-analysis/SKILL.md broken functions (orphaned req references, stray parentheses)
- Replace hardcoded UniqueSoft/APAW API URLs with get_target_repo() auto-detection in 3 files
- Update README.md, STRUCTURE.md, AGENTS.md with centralized auth documentation
- Add EVOLUTION_LOG Entry #5 documenting credentials extrication
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