docs: update 5-container refs to 9-container architecture (refs #101)

Update all documentation to reflect the current 9-container architecture
(6 application + 3 logging) after the logging stack upgrades. Add missing
OCR, Loki, Alloy, and Grafana services to context.json.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.ai/context.json

@@ -1,6 +1,6 @@
 {
   "version": "6.2.0",
-  "architecture": "simplified-5-container",
+  "architecture": "9-container",
   "repository": {
     "host": "gitea",
     "owner": "egullickson",
@@ -51,7 +51,7 @@
     "project_overview": {
       "instruction": "Start with README.md for complete architecture context",
       "files": ["README.md"],
-      "completeness": "100% - all navigation and 5-container architecture information"
+      "completeness": "100% - all navigation and 9-container architecture information"
     },
     "application_feature_work": {
       "instruction": "Load entire application feature directory (features are modules within backend)",
@@ -104,6 +104,26 @@
       "type": "cache",
       "description": "Redis cache with AOF persistence",
       "port": 6379
+    },
+    "mvp-ocr": {
+      "type": "ocr_service",
+      "description": "Python-based OCR for document text extraction",
+      "port": 8000
+    },
+    "mvp-loki": {
+      "type": "log_aggregation",
+      "description": "Grafana Loki for centralized log storage (30-day retention)",
+      "port": 3100
+    },
+    "mvp-alloy": {
+      "type": "log_collector",
+      "description": "Grafana Alloy for log collection and forwarding to Loki",
+      "port": 12345
+    },
+    "mvp-grafana": {
+      "type": "log_visualization",
+      "description": "Grafana for log querying and visualization",
+      "port": 3000
     }
   },
   "application_features": {
@@ -290,6 +310,6 @@
     "single_tenant_architecture": true,
     "simplified_deployment": true,
     "docker_first_development": true,
-    "container_count": 5
+    "container_count": 9
   }
 }