refactor: update Nginx configuration and Docker setup

- Change user directive in Nginx configuration from 'nginx' to 'www-data'.
- Update upstream server configurations in Nginx to use 'localhost' instead of service names.
- Modify Nginx server block to redirect HTTP to a status page instead of Grafana.
- Rename Alertmanager location from '/alertmanager/' to '/alerts/' for consistency.
- Remove deprecated status page configuration and related files.
- Adjust Prometheus configuration to reflect the new Docker network settings.

infra/alertmanager/alertmanager.yml

@@ -94,92 +94,26 @@ receivers:
       - url: 'http://localhost:5001/'
         send_resolved: true
 
-  # Critical alerts - immediate notification via multiple channels
+  # Critical alerts - immediate notification via webhook
   - name: 'critical-alerts'
-    email_configs:
-      - to: 'admin@{{DOMAIN}}'
-        subject: '🚨 CRITICAL ALERT: {{ .GroupLabels.alertname }}'
-        body: |
-          {{ range .Alerts }}
-          Alert: {{ .Annotations.summary }}
-          Description: {{ .Annotations.description }}
-          Severity: {{ .Labels.severity }}
-          Service: {{ .Labels.service }}
-          Instance: {{ .Labels.instance }}
-          Time: {{ .StartsAt }}
-          {{ end }}
-        html: |
-          <h2>🚨 Critical Alert</h2>
-          <table>
-            <tr><td><strong>Alert:</strong></td><td>{{ .GroupLabels.alertname }}</td></tr>
-            <tr><td><strong>Service:</strong></td><td>{{ .GroupLabels.service }}</td></tr>
-            <tr><td><strong>Time:</strong></td><td>{{ .GroupLabels.time }}</td></tr>
-          </table>
-          <h3>Alerts:</h3>
-          <ul>
-          {{ range .Alerts }}
-            <li><strong>{{ .Annotations.summary }}</strong><br/>
-                {{ .Annotations.description }}<br/>
-                <small>Instance: {{ .Labels.instance }} | Time: {{ .StartsAt }}</small>
-            </li>
-          {{ end }}
-          </ul>
     webhook_configs:
       - url: 'http://localhost:5001/critical'
         send_resolved: true
 
   # Warning alerts - less urgent notification
   - name: 'warning-alerts'
-    email_configs:
-      - to: 'admin@{{DOMAIN}}'
-        subject: '⚠️ WARNING: {{ .GroupLabels.alertname }}'
-        body: |
-          {{ range .Alerts }}
-          Alert: {{ .Annotations.summary }}
-          Description: {{ .Annotations.description }}
-          Severity: {{ .Labels.severity }}
-          Service: {{ .Labels.service }}
-          Instance: {{ .Labels.instance }}
-          Time: {{ .StartsAt }}
-          {{ end }}
     webhook_configs:
       - url: 'http://localhost:5001/warning'
         send_resolved: true
 
   # Bot-specific alerts
   - name: 'bot-alerts'
-    email_configs:
-      - to: 'bot-admin@{{DOMAIN}}'
-        subject: '🤖 Bot Alert: {{ .GroupLabels.alertname }}'
-        body: |
-          Bot Alert: {{ .GroupLabels.alertname }}
-          Service: {{ .GroupLabels.service }}
-          
-          {{ range .Alerts }}
-          - {{ .Annotations.summary }}
-            {{ .Annotations.description }}
-            Instance: {{ .Labels.instance }}
-            Time: {{ .StartsAt }}
-          {{ end }}
     webhook_configs:
       - url: 'http://localhost:5001/bot'
         send_resolved: true
 
   # Infrastructure alerts
   - name: 'infrastructure-alerts'
-    email_configs:
-      - to: 'infra@{{DOMAIN}}'
-        subject: '🏗️ Infrastructure Alert: {{ .GroupLabels.alertname }}'
-        body: |
-          Infrastructure Alert: {{ .GroupLabels.alertname }}
-          Service: {{ .GroupLabels.service }}
-          
-          {{ range .Alerts }}
-          - {{ .Annotations.summary }}
-            {{ .Annotations.description }}
-            Instance: {{ .Labels.instance }}
-            Time: {{ .StartsAt }}
-          {{ end }}
     webhook_configs:
       - url: 'http://localhost:5001/infrastructure'
         send_resolved: true