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

mcp_server_main.py

@@ -243,10 +243,8 @@ def create_app(auth=None):
     global app
     if auth:
         app.auth = auth
-        app.name = "Yargı MCP Server"
         logger.info("MCP server created with Bearer authentication enabled")
     else:
-        app.name = "Yargı MCP Server"
         logger.info("MCP server created with standard capabilities...")
     
     token_counter = TokenCountingMiddleware()