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/bddk_mcp_module/models.py

@@ -0,0 +1,43 @@
+# bddk_mcp_module/models.py
+
+from pydantic import BaseModel, Field
+from typing import List, Optional
+
+class BddkSearchRequest(BaseModel):
+    """
+    Request model for searching BDDK decisions via Tavily API.
+    
+    BDDK (Bankacılık Düzenleme ve Denetleme Kurumu) is Turkey's Banking
+    Regulation and Supervision Agency responsible for banking licenses,
+    electronic money institutions, and financial regulations.
+    """
+    keywords: str = Field(..., description="Search keywords in Turkish")
+    page: int = Field(1, ge=1, description="Page number (1-indexed)")
+    pageSize: int = Field(10, ge=1, le=50, description="Results per page (1-50)")
+
+class BddkDecisionSummary(BaseModel):
+    """Summary of a BDDK decision from search results."""
+    title: str = Field(..., description="Decision title")
+    document_id: str = Field(..., description="BDDK document ID (e.g., '310')")
+    content: str = Field(..., description="Decision summary/excerpt")
+
+class BddkSearchResult(BaseModel):
+    """Response model for BDDK decision search results."""
+    decisions: List[BddkDecisionSummary] = Field(
+        default_factory=list, 
+        description="List of matching BDDK decisions"
+    )
+    total_results: int = Field(0, description="Total number of results")
+    page: int = Field(1, description="Current page number")
+    pageSize: int = Field(10, description="Results per page")
+
+class BddkDocumentMarkdown(BaseModel):
+    """
+    BDDK decision document converted to Markdown format.
+    
+    Supports paginated content for long documents (5000 chars per page).
+    """
+    document_id: str = Field(..., description="BDDK document ID")
+    markdown_content: str = Field("", description="Document content in Markdown")
+    page_number: int = Field(1, description="Current page number")
+    total_pages: int = Field(1, description="Total number of pages")