docs: Renumber duplicate ADRs to eliminate conflicts

Resolved all duplicate ADR numbers by renumbering based on chronological order:

ADR Renumbering Map:
- ADR-006-indieauth-client-identification.md → ADR-023
- ADR-010-static-identity-page.md → ADR-024
- ADR-019-indieauth-pkce-authentication.md → ADR-025
- ADR-022-indieauth-token-exchange-compliance.md → ADR-026
- ADR-022-indieauth-authentication-endpoint-correction.md → ADR-027

Files Kept Original Numbers (earliest chronologically):
- ADR-006-python-virtual-environment-uv.md (2025-11-18 19:21:31)
- ADR-010-authentication-module-design.md (2025-11-18 20:35:36)
- ADR-019-indieauth-correct-implementation.md (2025-11-19 15:43:38)
- ADR-022-auth-route-prefix-fix.md (2025-11-22 18:22:08)

Updated:
- ADR titles inside each renamed file
- Cross-references in implementation reports
- CHANGELOG.md references to ADR-025
- Renamed associated report files to match new ADR numbers

CHANGELOG.md

@@ -157,7 +157,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **v0.8.0**: Correct implementation based on official IndieLogin.com API documentation.
 
 ### Related Documentation
-- ADR-019: IndieAuth Correct Implementation Based on IndieLogin.com API
+- ADR-025: IndieAuth Correct Implementation Based on IndieLogin.com API
 - Design Document: docs/designs/indieauth-pkce-authentication.md
 - ADR-016: Superseded (h-app client discovery not required)
 - ADR-017: Superseded (OAuth metadata not required)