feat: add MCP server for exposing compliance data to LLMs

New `compliance-mcp` crate providing a Model Context Protocol server
with 7 tools: list/get/summarize findings, list SBOM packages, SBOM
vulnerability report, list DAST findings, and DAST scan summary.
Supports stdio (local dev) and Streamable HTTP (deployment via MCP_PORT).
Includes Dockerfile, CI clippy check, and Coolify deploy job.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Cargo.toml

@@ -5,6 +5,7 @@ members = [
     "compliance-dashboard",
     "compliance-graph",
     "compliance-dast",
+    "compliance-mcp",
 ]
 resolver = "2"