feat: Initial NPM MCP server implementation

- NpmClient with JWT auth and auto-refresh
- FastMCP server with 5 tools (list_proxy_hosts, get_proxy_host_details, get_system_health, search_audit_logs, list_certificates)
- Docker support with multi-stage build using uv
- Supports stdio and streamable HTTP transports
- GitHub Actions for tests and Docker builds

src/npm_mcp/config.py

@@ -0,0 +1,27 @@
+"""Configuration management using pydantic-settings."""
+
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    """Application settings loaded from environment variables."""
+
+    model_config = SettingsConfigDict(
+        env_prefix="NPM_",
+        env_file=".env",
+        env_file_encoding="utf-8",
+        extra="ignore",
+    )
+
+    # NPM API Configuration
+    api_url: str = "http://localhost:81/api"
+    identity: str = ""
+    secret: str = ""
+
+    # MCP Server Configuration
+    mcp_host: str = "0.0.0.0"
+    mcp_port: int = 8000
+    mcp_transport: str = "stdio"  # "stdio" or "http"
+
+
+settings = Settings()