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_config.py

@@ -149,3 +149,65 @@ def test_mode_detection_company(tmp_path, monkeypatch):
 
     assert result['mode'] == 'company'
     assert result['repo'] is None
+
+
+# ========================================
+# GIT URL PARSING TESTS
+# ========================================
+
+def test_parse_git_url_ssh_format():
+    """Test parsing SSH format git URL"""
+    config = GiteaConfig()
+
+    # SSH with port: ssh://git@host:port/owner/repo.git
+    url = "ssh://git@hotserv.tailc9b278.ts.net:2222/personal-projects/personal-portfolio.git"
+    result = config._parse_git_url(url)
+    assert result == "personal-projects/personal-portfolio"
+
+
+def test_parse_git_url_ssh_short_format():
+    """Test parsing SSH short format git URL"""
+    config = GiteaConfig()
+
+    # SSH short: git@host:owner/repo.git
+    url = "git@github.com:owner/repo.git"
+    result = config._parse_git_url(url)
+    assert result == "owner/repo"
+
+
+def test_parse_git_url_https_format():
+    """Test parsing HTTPS format git URL"""
+    config = GiteaConfig()
+
+    # HTTPS: https://host/owner/repo.git
+    url = "https://gitea.hotserv.cloud/personal-projects/leo-claude-mktplace.git"
+    result = config._parse_git_url(url)
+    assert result == "personal-projects/leo-claude-mktplace"
+
+
+def test_parse_git_url_http_format():
+    """Test parsing HTTP format git URL"""
+    config = GiteaConfig()
+
+    # HTTP: http://host/owner/repo.git
+    url = "http://gitea.hotserv.cloud/personal-projects/repo.git"
+    result = config._parse_git_url(url)
+    assert result == "personal-projects/repo"
+
+
+def test_parse_git_url_without_git_suffix():
+    """Test parsing git URL without .git suffix"""
+    config = GiteaConfig()
+
+    url = "https://github.com/owner/repo"
+    result = config._parse_git_url(url)
+    assert result == "owner/repo"
+
+
+def test_parse_git_url_invalid_format():
+    """Test parsing invalid git URL returns None"""
+    config = GiteaConfig()
+
+    url = "not-a-valid-url"
+    result = config._parse_git_url(url)
+    assert result is None