feat: Add Sigorta Tahkim Komisyonu MCP module (3 tools)

Add Insurance Arbitration Commission integration with Tavily search
and direct PDF download for 64 quarterly journal issues (2010-2025).

Tools:
- search_sigorta_tahkim_decisions: Search via Tavily API
- get_sigorta_tahkim_document_markdown: PDF download + paginated markdown
- search_within_sigorta_tahkim_issue: Keyword search within individual
  decisions of a journal issue, with Turkish İ/I case folding support

Total tools: 25 (was 22)

sigorta_tahkim_mcp_module/models.py

@@ -0,0 +1,59 @@
+# sigorta_tahkim_mcp_module/models.py
+
+from pydantic import BaseModel, Field
+from typing import List
+
+
+class SigortaTahkimSearchRequest(BaseModel):
+    """Request model for searching Sigorta Tahkim Komisyonu decisions via Tavily API."""
+    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 SigortaTahkimDecisionSummary(BaseModel):
+    """Summary of a Sigorta Tahkim decision from search results."""
+    title: str = Field(..., description="Decision title or journal issue info")
+    document_id: str = Field(..., description="Journal issue number (e.g., '64')")
+    content: str = Field(..., description="Decision summary/excerpt")
+    url: str = Field("", description="Source URL")
+
+
+class SigortaTahkimSearchResult(BaseModel):
+    """Response model for Sigorta Tahkim decision search results."""
+    decisions: List[SigortaTahkimDecisionSummary] = Field(
+        default_factory=list,
+        description="List of matching 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 SigortaTahkimDocumentMarkdown(BaseModel):
+    """Sigorta Tahkim journal issue converted to Markdown format."""
+    document_id: str = Field(..., description="Journal issue number")
+    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")
+    source_url: str = Field("", description="PDF source URL")
+
+
+class SigortaTahkimSearchWithinMatch(BaseModel):
+    """A single matching decision from search within a journal issue."""
+    decision_header: str = Field(..., description="Decision header (date and K-number)")
+    relevance_score: int = Field(0, description="Number of keyword matches")
+    excerpt: str = Field("", description="Matching excerpt with context")
+    body_length: int = Field(0, description="Full decision body length in chars")
+
+
+class SigortaTahkimSearchWithinResult(BaseModel):
+    """Response model for search within a journal issue."""
+    issue_number: str = Field(..., description="Journal issue number searched")
+    keyword: str = Field("", description="Search keyword used")
+    total_decisions: int = Field(0, description="Total decisions in issue")
+    matching_decisions: int = Field(0, description="Number of matching decisions")
+    matches: List[SigortaTahkimSearchWithinMatch] = Field(
+        default_factory=list,
+        description="List of matching decisions sorted by relevance"
+    )