Add remote routing URL support (#6168)

* Add remote routing URL support

* Harden remote routing refresh

* fix(sub): harden remote routing fetch and accept Mihomo src rule flag

Remote routing bytes reach the YAML/JSON parsers from goroutines that run
outside Gin's recovery, so a parser panic on crafted input would take down
the whole panel. Contain it in fetch() (a panic now degrades to a failed
refresh that keeps the last-good value and releases the in-flight slot)
and start the refresh, cache-load and startup-warm goroutines through
common.GoRecover like the other background workers.

The route-graph validator only skipped a trailing no-resolve flag, so a
valid Mihomo rule like IP-CIDR,x,DIRECT,no-resolve,src was rejected as an
unknown target; skip both option flags.

Also deduplicate the HTTPS-source classification into
common.ParseRemoteRoutingURL so the save-time validator and the resolver
can never drift (internal/sub imports internal/web/service, so the copy
existed only to avoid the import cycle), move the test-only
mergeRemoteClashRulesYAML helper into the test file, and trim oversized
comment blocks.

---------

Co-authored-by: Duxxie <yelloduxx@users.noreply.github.com>
Co-authored-by: Sanaei <ho3ein.sanaei@gmail.com>

internal/web/web.go

@@ -296,6 +296,7 @@ const (
 	cadenceNodeTraffic   = "@every 5s"
 	cadenceOutboundSub   = "@every 5m"
 	cadenceReapOrphans   = "@every 5m"
+	cadenceRemoteRouting = "@every 5m"
 	cadenceXrayLogPrune  = "@every 10m"
 	cadenceCheckHash     = "@every 2m"
 	// cpu.Percent samples over a full minute (blocking), so a finer cadence just
@@ -343,6 +344,12 @@ func (s *Server) startTask(restartXray bool, loc *time.Location) {
 
 	_, _ = s.cron.AddJob(cadenceReapOrphans, job.NewReapSyncOrphansJob())
 
+	// Warm permanent routing URLs immediately and refresh them outside the
+	// latency-sensitive subscription request path.
+	remoteRoutingJob := job.NewRemoteRoutingJob()
+	_, _ = s.cron.AddJob(cadenceRemoteRouting, remoteRoutingJob)
+	common.GoRecover("remote-routing-warm", remoteRoutingJob.Run)
+
 	// check client ips from log file every day
 	_, _ = s.cron.AddJob("@daily", job.NewClearLogsJob())
 	_, _ = s.cron.AddJob(cadenceXrayLogPrune, job.NewPruneXrayLogsJob())