feat: add missing administration tools

Add 20+ new MCP tools for repository administration:

- Repository: get_repo, repo_write (edit/delete/transfer), list_forks
- Branch Protection: read (list/get) and write (create/edit/delete)
- Webhooks: read (list/get) and write (create/edit/delete/test)
- Collaborators: read (list) and write (add/delete)
- Deploy Keys: read (list/get) and write (create/delete)
- Topics: read (list) and write (add/delete/set)
- Compare: get_compare for branch/tag/commit comparison
- Organization: org_read (get/list_teams/get_team/list_team_members/list_team_repos)
  and org_write (create_team/delete_team/add_team_member/remove_team_member/add_team_repo/remove_team_repo)
- PR enhancements: list_files and is_merged methods added to pull_request_read

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

operation/operation.go

@@ -16,6 +16,7 @@ import (
 	"gitea.com/gitea/gitea-mcp/operation/label"
 	"gitea.com/gitea/gitea-mcp/operation/milestone"
 	"gitea.com/gitea/gitea-mcp/operation/notification"
+	"gitea.com/gitea/gitea-mcp/operation/org"
 	"gitea.com/gitea/gitea-mcp/operation/pull"
 	"gitea.com/gitea/gitea-mcp/operation/repo"
 	"gitea.com/gitea/gitea-mcp/operation/search"
@@ -69,6 +70,9 @@ func RegisterTool(s *server.MCPServer) {
 	// Time Tracking Tool
 	s.AddTools(timetracking.Tool.Tools()...)
 
+	// Organization Tool
+	s.AddTools(org.Tool.Tools()...)
+
 	s.DeleteTools("")
 }