fix(mcp): audit record keeps legacy name/index alias targets

A caller using the #38 aliases (name for repo, index for number) left no
target in the tools/call audit record.

Refs #64

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/mcp/audit.go

@@ -16,7 +16,7 @@ import (
 // they identify what a call acted on without copying what it wrote. Every
 // other argument (file content, issue bodies) is reduced to args_bytes so the
 // audit trail never becomes a second copy of repo content (gitea-mcp#64).
-var auditTargetKeys = []string{"owner", "repo", "number", "branch", "path", "tag"}
+var auditTargetKeys = []string{"owner", "repo", "name", "number", "index", "branch", "path", "tag"}
 
 // logToolCall emits one structured record per tools/call (OWASP MCP08).
 func logToolCall(ctx context.Context, name string, args json.RawMessage, start time.Time, err error) {