Add mcp-secure module: OAuth2 resource server, per-tool scopes, and MDC audit logging for an MCP server

- JWT bearer authentication via spring-boot-starter-oauth2-resource-server, validated against
  an RSA keypair DemoJwtIssuer generates and signs with locally, so the whole module runs and
  tests deterministically with no external Authorization Server.
- @PreAuthorize on @McpTool methods maps SCOPE_orders:read / SCOPE_orders:write to lookup_order
  and refund_order -- confirmed empirically that method security actually applies to a bean the
  MCP server autoconfiguration invokes via reflection, since it invokes the Spring-proxied bean.
- SecurityFilterChain requires authentication on every request, so tool discovery (initialize/
  tools-list) is rejected before it ever reaches the MCP dispatcher -- no anonymous tool listing.
- ToolAuditAspect logs every tool call through MDC (subject, scopes, tool, outcome), pinned to
  @Order(150) -- between AuthorizationInterceptorsOrder.PRE_FILTER (100) and PRE_AUTHORIZE (200)
  -- so it wraps @PreAuthorize's interceptor and still logs denied calls, not only successful
  ones. Verified with a real Logback ListAppender reading back real MDC contents.

Two real findings worth a note: Spring Boot 4.0 renamed spring-boot-starter-aop to
spring-boot-starter-aspectj (the old artifact stops existing after 4.0.0-M2); and Spring AI's
AbstractSyncMcpToolMethodCallback.createSyncErrorResult concatenates an exception's message with
its root cause's message, which duplicates the text when they're the same exception -- visible
directly in the captured output when @PreAuthorize denies a call ("Access Denied\nAccess Denied").

5/5 tests pass against a real running server over real Streamable HTTP, with real signed JWTs.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01FtpJvZfg4nvLvtzgJTDWpB

mcp-secure/output/03-write-scope-refund-succeeds.txt

@@ -0,0 +1,10 @@
+# A token with only orders:write calling refund_order, then lookup_order
+
+refund_order (scope orders:write present):
+  isError = false
+  text = {"id":"ORD-1002","customer":"Rohan Mehta","status":"REFUNDED","items":["27\" monitor"],"total":18999.00}
+
+lookup_order (scope orders:read absent):
+  isError = true
+  text = Access Denied
+Access Denied