fix(lint): check resp.Body.Close()'s error (errcheck)

Caught by CI, not locally -- this sandbox's golangci-lint crashes on any
repo, a pre-existing environment issue unrelated to this code (documented
in dispatch's own session history). gitea-mcp's actual CI run has a
working linter and correctly flagged this.

internal/adminbootstrap/adminbootstrap.go

@@ -160,7 +160,7 @@ func (b Bootstrapper) userExists(ctx context.Context, username string) (bool, er
 	if err != nil {
 		return false, err
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 	switch resp.StatusCode {
 	case http.StatusOK:
 		return true, nil
@@ -185,7 +185,7 @@ func (b Bootstrapper) createUser(ctx context.Context, req Request, password stri
 	if err != nil {
 		return err
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 	if resp.StatusCode/100 != 2 {
 		return statusErr(resp)
 	}
@@ -199,7 +199,7 @@ func (b Bootstrapper) resetPassword(ctx context.Context, username, password stri
 	if err != nil {
 		return err
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 	if resp.StatusCode/100 != 2 {
 		return statusErr(resp)
 	}
@@ -226,7 +226,7 @@ func (b Bootstrapper) mintToken(ctx context.Context, username, password, tokenNa
 	if err != nil {
 		return "", err
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 	if resp.StatusCode/100 != 2 {
 		return "", statusErr(resp)
 	}
@@ -251,7 +251,7 @@ func (b Bootstrapper) grantReadAccess(ctx context.Context, r RepoRef, username s
 	if err != nil {
 		return err
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 	if resp.StatusCode/100 != 2 {
 		return statusErr(resp)
 	}