fix: add repo auto-detection and improve org validation

1. Repo Auto-Detection (config.py):
   - Added _detect_repo_from_git() to parse git remote URL
   - Supports SSH, SSH short, HTTPS, HTTP URL formats
   - Falls back to git remote when GITEA_REPO not set

2. Organization Validation (gitea_client.py):
   - Changed is_org_repo() to use /orgs/{owner} endpoint
   - Added _is_organization() method for reliable org detection
   - Fixes issue where owner.type was null in Gitea API

3. Tests:
   - Added 6 tests for git URL parsing
   - Added 3 tests for org detection

Fixes #64

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

mcp-servers/gitea/tests/test_gitea_client.py

@@ -222,3 +222,47 @@ def test_no_repo_specified_error(gitea_client):
             client.list_issues()
 
         assert "Repository not specified" in str(exc_info.value)
+
+
+# ========================================
+# ORGANIZATION DETECTION TESTS
+# ========================================
+
+def test_is_organization_true(gitea_client):
+    """Test _is_organization returns True for valid organization"""
+    mock_response = Mock()
+    mock_response.status_code = 200
+
+    with patch.object(gitea_client.session, 'get', return_value=mock_response):
+        result = gitea_client._is_organization('personal-projects')
+
+        assert result is True
+        gitea_client.session.get.assert_called_once_with(
+            'https://test.com/api/v1/orgs/personal-projects'
+        )
+
+
+def test_is_organization_false(gitea_client):
+    """Test _is_organization returns False for user account"""
+    mock_response = Mock()
+    mock_response.status_code = 404
+
+    with patch.object(gitea_client.session, 'get', return_value=mock_response):
+        result = gitea_client._is_organization('lmiranda')
+
+        assert result is False
+
+
+def test_is_org_repo_uses_orgs_endpoint(gitea_client):
+    """Test is_org_repo uses /orgs endpoint instead of owner.type"""
+    mock_response = Mock()
+    mock_response.status_code = 200
+
+    with patch.object(gitea_client.session, 'get', return_value=mock_response):
+        result = gitea_client.is_org_repo('personal-projects/repo')
+
+        assert result is True
+        # Should call /orgs/personal-projects, not /repos/.../
+        gitea_client.session.get.assert_called_once_with(
+            'https://test.com/api/v1/orgs/personal-projects'
+        )