docs: update wiki for v0.2.6 - integrations and Custom REST provider
Updated 5 wiki pages:
Home.md:
- Updated version to v0.2.6
- Added Custom REST provider and custom provider support to features
- Updated integration status from stubs to complete
- Updated release table with v0.2.3 and v0.2.6 highlights
Integrations.md:
- Complete rewrite: Changed from 'v0.2 stubs' to fully implemented
- Added detailed docs for Confluence REST API client (6 tests)
- Added detailed docs for ServiceNow REST API client (7 tests)
- Added detailed docs for Azure DevOps REST API client (6 tests)
- Documented OAuth2 PKCE flow implementation
- Added database schema for credentials and integration_config tables
- Added troubleshooting section with common OAuth/API errors
AI-Providers.md:
- Added section for Custom Provider (Custom REST provider)
- Documented Custom REST provider API format differences from OpenAI
- Added request/response format examples
- Added configuration instructions and troubleshooting
- Documented custom provider fields (api_format, custom_endpoint_path, etc)
- Added available Custom REST provider models list
IPC-Commands.md:
- Replaced 'v0.2 stubs' section with full implementation details
- Added OAuth2 commands (initiate_oauth, handle_oauth_callback)
- Added Confluence commands (5 functions)
- Added ServiceNow commands (5 functions)
- Added Azure DevOps commands (5 functions)
- Documented authentication storage with AES-256-GCM encryption
- Added common types (ConnectionResult, PublishResult, TicketResult)
Database.md:
- Updated migration count from 10 to 11
- Added migration 011: credentials and integration_config tables
- Documented AES-256-GCM encryption for OAuth tokens
- Added usage notes for OAuth2 vs basic auth storage
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