feat(tenant): make monitoring parse & compliance judge models configurable

Replace the hardcoded doubao-lite model used for monitoring answer
parsing and compliance LLM judging with configurable values, resolved
from config with env overrides and a legacy default fallback.

- Add llm.monitoring_answer_parse_model and compliance.llm_judge_model
  to config struct, env overrides, and all config files
- Thread the resolved model through MonitoringCallbackService via a
  ConfigProvider and into parseMonitoringAnswerWithLLM
- Pass compliance.llm_judge_model into the review-job LLM request

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

server/internal/shared/config/config_test.go

@@ -27,6 +27,30 @@ llm:
 	}
 }
 
+func TestLoadAppliesSpecializedLLMModelEnvOverrides(t *testing.T) {
+	t.Setenv("LLM_MONITORING_ANSWER_PARSE_MODEL", "env-monitoring-parse")
+	t.Setenv("COMPLIANCE_LLM_JUDGE_MODEL", "env-compliance-judge")
+
+	configPath := writeTestConfig(t, `
+llm:
+  monitoring_answer_parse_model: "config-monitoring-parse"
+compliance:
+  llm_judge_model: "config-compliance-judge"
+`)
+
+	cfg, err := Load(configPath)
+	if err != nil {
+		t.Fatalf("Load() error = %v", err)
+	}
+
+	if cfg.LLM.MonitoringAnswerParseModel != "env-monitoring-parse" {
+		t.Fatalf("expected env monitoring parse model, got %q", cfg.LLM.MonitoringAnswerParseModel)
+	}
+	if cfg.Compliance.LLMJudgeModel != "env-compliance-judge" {
+		t.Fatalf("expected env compliance judge model, got %q", cfg.Compliance.LLMJudgeModel)
+	}
+}
+
 func TestDatabaseConfigDSNEscapesCredentials(t *testing.T) {
 	cfg := DatabaseConfig{
 		Host:     "db.internal",