chore(deps): pin typescript at 6.x (4k deferred) + oidc header comment v5 -> v6

TypeScript 7 typechecks this codebase clean, but typescript-eslint (peer:
'>=4.8.4 <6.1.0') cannot parse under it — eslint hard-fails. Pinned back
to the TS 6 line per the plan's incompatibility contingency; revisit when
typescript-eslint ships TS 7 support (tracked in the QA plan backlog).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

package-lock.json

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+        "node": ">=10"
+      }
+    },
     "node_modules/unbash": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/unbash/-/unbash-4.0.2.tgz",

services/oidcService.cts

@@ -4,7 +4,7 @@
 /**
  * OIDC / authentik integration service.
  *
- * Uses openid-client@5 for full ID token validation including JWKS-backed
+ * Uses openid-client@6 for full ID token validation including JWKS-backed
  * signature verification, issuer, audience, expiry, and nonce checks.
  *
  * Disabled by default. OIDC settings are resolved from the database first,