fix(grok): clear golangci errcheck and gofmt on free-quota path

Check the sync.Map type assertion in free-quota refresh coalescing, and
gofmt migration checksum rules plus prompt-audit route map alignment.

backend/internal/repository/migrations_runner.go

@@ -86,8 +86,8 @@ var migrationChecksumCompatibilityRules = map[string]migrationChecksumCompatibil
 	// 220 originally cleared video prices for all non-grok platforms (including composite);
 	// composite is now preserved because it may route to Grok accounts.
 	"220_clear_non_grok_video_generation_config.sql": newMigrationChecksumCompatibilityRule("85e320b9ec64f2d3fcd8cf705b2b4e76a7b49f7a57140c14bff97f32691c818b", "3da48c8fdffe6390325f43d08b8e353e0a365df43d44a78dbbe655d0deb18402"),
-	"219_group_search_price_per_1k.sql": newMigrationChecksumCompatibilityRule("e86786ebcc3b14206fd2d321380a4e50e80cdadbfcf4962c639255e6a14008db", "df6ffd71b97e30ec2c8fe7b95e15783042dea58c553e32701ee7c42a5619af80"),
-	"218_group_audio_voice_pricing.sql": newMigrationChecksumCompatibilityRule("40ee9f3a2af0e0a5e99dabc878fd0fe98be1011f26bcfcefcac7197f7081f0e7", "c2a5e5b4ffd6968ad1c10593289fbc11192cdea19fec3ed9bce3a84eff9a8351"),
+	"219_group_search_price_per_1k.sql":              newMigrationChecksumCompatibilityRule("e86786ebcc3b14206fd2d321380a4e50e80cdadbfcf4962c639255e6a14008db", "df6ffd71b97e30ec2c8fe7b95e15783042dea58c553e32701ee7c42a5619af80"),
+	"218_group_audio_voice_pricing.sql":              newMigrationChecksumCompatibilityRule("40ee9f3a2af0e0a5e99dabc878fd0fe98be1011f26bcfcefcac7197f7081f0e7", "c2a5e5b4ffd6968ad1c10593289fbc11192cdea19fec3ed9bce3a84eff9a8351"),
 }
 
 // ApplyMigrations 将嵌入的 SQL 迁移文件应用到指定的数据库。

backend/internal/server/routes/prompt_audit_route_coverage_test.go

@@ -46,8 +46,8 @@ func TestEveryGatewayPOSTRouteIsClassifiedForPromptAuditCoverage(t *testing.T) {
 		"/videos/edits":             {"grok_media.go"},
 		"/videos/extensions":        {"grok_media.go"},
 		"/models/*modelAction":      {"gemini_v1beta_handler.go"},
-		"/tts":                       {"grok_audio.go"},
-		"/web_search":                {"gateway_web_search.go"},
+		"/tts":                      {"grok_audio.go"},
+		"/web_search":               {"gateway_web_search.go"},
 	}
 	excluded := map[string]string{
 		"/messages/count_tokens":     "tokenization only; it does not execute a model request",

backend/internal/service/grok_free_quota_gate.go

@@ -199,7 +199,10 @@ func scheduleGrokFreeQuotaStatsRefresh(
 		return
 	}
 	inFlightRoot, _ := freeQuotaRefreshInFlight.LoadOrStore(cache, &sync.Map{})
-	inFlight := inFlightRoot.(*sync.Map)
+	inFlight, ok := inFlightRoot.(*sync.Map)
+	if !ok || inFlight == nil {
+		return
+	}
 
 	toFetch := make([]int64, 0, len(accountIDs))
 	for _, id := range accountIDs {