fix(ollama): worker reaches ollama via service name + bump timeouts 30s→90s

Two distinct prod failures behind the 15% vocab-enrichment success rate:

1. Worker was hitting http://localhost:11434 because docker-compose only
   set Ollama__BaseUrl on the api service, not the worker. Without the
   env override, appsettings.json's "http://localhost:11434" stayed in
   effect — every BookMetadataGenerator call logged "Connection refused".
   Fix: add Ollama__BaseUrl + Ollama__Model to the worker env block,
   mirroring the api block.

2. API was reaching Ollama fine (http://ollama:11434) but timing out at
   30s — gemma4:e4b is CPU-only on this box (no GPU), 100% CPU, first
   inference after model load is comfortably north of 30s. Fix: bump
   Ollama:TimeoutSeconds 30 → 90 in both api and worker appsettings.

Net effect on the article: distractor/hint/explanation success rate
should climb from 15% to ~100% once deployed. Will re-collect stats
after rollout before publishing.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: mrviduus

backend/src/Api/appsettings.json

@@ -45,7 +45,7 @@
   "Ollama": {
     "BaseUrl": "http://localhost:11434",
     "Model": "gemma4:e4b",
-    "TimeoutSeconds": 30
+    "TimeoutSeconds": 90
   },
   "LLM": {
     "DefaultProvider": "openai",

backend/src/Worker/appsettings.json

@@ -12,7 +12,7 @@
   "Ollama": {
     "BaseUrl": "http://localhost:11434",
     "Model": "gemma4:e4b",
-    "TimeoutSeconds": 30
+    "TimeoutSeconds": 90
   },
   "LLM": {
     "DefaultProvider": "ollama",

docker-compose.yml

@@ -110,6 +110,12 @@ services:
       ConnectionStrings__Default: "Host=db;Port=5432;Database=${POSTGRES_DB};Username=${POSTGRES_USER};Password=${POSTGRES_PASSWORD}"
       Storage__RootPath: /storage
       Search__Provider: ${SEARCH_PROVIDER:-postgres}
+      # Worker reaches Ollama via the Docker service name, not localhost
+      # (without this override it falls back to appsettings.json's
+      # "http://localhost:11434" and silently fails every vocab-enrichment
+      # call — symptom: words save with NULL distractors/hint/explanation).
+      Ollama__BaseUrl: http://ollama:11434
+      Ollama__Model: gemma4:e4b
       OTEL_EXPORTER_OTLP_ENDPOINT: http://aspire-dashboard:18889
     volumes:
       - ./data/storage:/storage