review fixes apr 2026 (#130)

* Multiple fixes

- refresh coordinator dedup + memory pressure wire
- middleware sse consolidation + timer leak + claim cache
- universal cache sync backfill + isDebug gate
- lazy background task race
- memory monitor stw cached + refresh() api

* fix(auth): suppress OIDC redirects on non-navigation requests

- [x] Add isNonNavigationRequest using Sec-Fetch-Mode and Accept headers
- [x] Add comprehensive TestIsNonNavigationRequest
- [x] Update ServeHTTP to 401 non-navigation and AJAX requests

Fixes #129

* feat(config): add custom CA and insecure skip verify for OIDC TLS

- [x] Add CACertPath, CACertPEM, InsecureSkipVerify to Config
- [x] Implement loadCACertPool for CA bundle loading
- [x] Update HTTPClientConfig with RootCAs and InsecureSkipVerify
- [x] Apply CA pool and skip verify to pooled HTTP clients
- [x] Enhance configKey to distinguish TLS configs
- [x] Add comprehensive ca_cert_test.go

Fixes #125

* feat(oidc): add custom CA certificate support for private OIDC providers

- [x] Add caCertPath, caCertPEM, insecureSkipVerify config options
- [x] Update traefik.yml with new OIDC client config fields
- [x] Add configuration schema descriptions for new options
- [x] Update README table and add Custom CA Certificates section

* Fix the documentation.

* test(redis): add oversized argument rejection test

- [x] Add TestRedisConn_RejectOversizedArgumentBytes
- [x] Import strings package

* Dependencies cleanup

vendor/github.com/pmezard/go-difflib/difflib/difflib.go

@@ -199,15 +199,12 @@ func (m *SequenceMatcher) isBJunk(s string) bool {
 // If IsJunk is not defined:
 //
 // Return (i,j,k) such that a[i:i+k] is equal to b[j:j+k], where
-//
-//	alo <= i <= i+k <= ahi
-//	blo <= j <= j+k <= bhi
-//
+//     alo <= i <= i+k <= ahi
+//     blo <= j <= j+k <= bhi
 // and for all (i',j',k') meeting those conditions,
-//
-//	k >= k'
-//	i <= i'
-//	and if i == i', j <= j'
+//     k >= k'
+//     i <= i'
+//     and if i == i', j <= j'
 //
 // In other words, of all maximal matching blocks, return one that
 // starts earliest in a, and of all those maximal matching blocks that