Fix tools visibility - revert to v0.1.6 authentication approach

- Disable issuer validation in BearerAuthProvider (issuer=None)
- Simplify authentication condition (remove auth_enabled check)
- Revert CORS middleware to simple configuration
- Fix OAuth metadata endpoint to match v0.1.6
- Apply conditional auth only to MCP server creation

Critical fixes for Claude AI tools discovery

saidsurucu-yargi-mcp-f5fa007/mcp_auth/__init__.py

@@ -0,0 +1,28 @@
+"""
+MCP Auth Toolkit - OAuth 2.1 + Authorization for Model Context Protocol Servers
+Integrated with Clerk Authentication
+"""
+
+from .middleware import (
+    AuthContext,
+    FastMCPAuthWrapper,
+    MCPAuthMiddleware,
+    auth_required,
+)
+from .oauth import OAuthConfig, OAuthProvider
+from .policy import PolicyEngine, ToolPolicy, create_default_policies
+from .storage import PersistentStorage
+
+__version__ = "0.1.0"
+__all__ = [
+    "OAuthProvider",
+    "OAuthConfig", 
+    "AuthContext",
+    "auth_required",
+    "create_default_policies",
+    "MCPAuthMiddleware",
+    "FastMCPAuthWrapper",
+    "PolicyEngine",
+    "ToolPolicy",
+    "PersistentStorage",
+]