feat(raw-api): register gitea_request tool and wire server dispatch

Registers gitea_request in AVAILABLE_TOOLS with write_operation=False
(deliberate: a static flag cannot describe a read-or-write tool; the handler
authorizes writes per-method) and maps the tool name to raw_api_request_tool in
the server handler registry.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/aegis_gitea_mcp/server.py

@@ -60,6 +60,7 @@ from aegis_gitea_mcp.request_context import (
 )
 from aegis_gitea_mcp.security import sanitize_data
 from aegis_gitea_mcp.tools.arguments import extract_repository, extract_target_path
+from aegis_gitea_mcp.tools.raw_tools import raw_api_request_tool
 from aegis_gitea_mcp.tools.read_tools import (
     compare_refs_tool,
     get_branch_tool,
@@ -420,6 +421,9 @@ TOOL_HANDLERS: dict[str, ToolHandler] = {
     "create_branch": create_branch_tool,
     "create_milestone": create_milestone_tool,
     "edit_issue_comment": edit_issue_comment_tool,
+    # Generic raw API dispatch (escape hatch). Registered as a read tool so GETs
+    # work without write-mode; the handler authorizes writes per-method itself.
+    "gitea_request": raw_api_request_tool,
 }