feat: add comprehensive logging infrastructure

- Add Loki/Prometheus/Grafana stack in logging-stack/
- Add log-ingest service for receiving events from AI stacks
- Add Grafana dashboard with stack_name filtering
- Update Dokploy client with setApplicationEnv method
- Configure STACK_NAME env var for deployed stacks
- Add alerting rules for stack health monitoring

logging-stack/alerting/ai-stack-alerts.yml

@@ -0,0 +1,62 @@
+groups:
+  - name: ai-stack-alerts
+    rules:
+      - alert: StackUnhealthy
+        expr: up{job="ai-stacks"} == 0
+        for: 5m
+        labels:
+          severity: critical
+        annotations:
+          summary: "Stack {{ $labels.stack_name }} is down"
+          description: "AI Stack {{ $labels.stack_name }} has been unhealthy for more than 5 minutes."
+
+      - alert: HighErrorRate
+        expr: |
+          sum by (stack_name) (rate(opencode_errors_total[5m])) 
+          / 
+          sum by (stack_name) (rate(opencode_messages_total[5m])) 
+          > 0.1
+        for: 10m
+        labels:
+          severity: warning
+        annotations:
+          summary: "High error rate on {{ $labels.stack_name }}"
+          description: "Stack {{ $labels.stack_name }} has error rate above 10% for 10 minutes."
+
+      - alert: NoActivity
+        expr: |
+          time() - opencode_last_activity_timestamp > 3600
+        for: 5m
+        labels:
+          severity: info
+        annotations:
+          summary: "No activity on {{ $labels.stack_name }}"
+          description: "Stack {{ $labels.stack_name }} has had no activity for over 1 hour."
+
+      - alert: HighTokenUsage
+        expr: |
+          sum by (stack_name) (increase(opencode_tokens_total[1h])) > 100000
+        for: 5m
+        labels:
+          severity: warning
+        annotations:
+          summary: "High token usage on {{ $labels.stack_name }}"
+          description: "Stack {{ $labels.stack_name }} has used over 100k tokens in the last hour."
+
+      - alert: LogIngestDown
+        expr: up{job="log-ingest"} == 0
+        for: 2m
+        labels:
+          severity: critical
+        annotations:
+          summary: "Log ingest service is down"
+          description: "The central log ingest service has been down for more than 2 minutes."
+
+      - alert: LokiDown
+        expr: up{job="loki"} == 0
+        for: 2m
+        labels:
+          severity: critical
+        annotations:
+          summary: "Loki is down"
+          description: "Loki log aggregation service has been down for more than 2 minutes."