fix: env var overrides for campaign settings (hf_token, ollama_host etc)

backend/app/config.py

@@ -64,3 +64,34 @@ CAMPAIGN_SETTINGS = {
     "player_recap_style": "story",
     "player_recap_custom_prompt": "",
 }
+
+# Env var names that can override CAMPAIGN_SETTINGS at read time.
+# Set these in docker-compose.yml to prefill the setup wizard.
+CAMPAIGN_ENV_OVERRIDES = {
+    "hf_token": "NAT20_HF_TOKEN",
+    "whisper_model": "NAT20_WHISPER_MODEL",
+    "whisper_compute_type": "NAT20_WHISPER_COMPUTE_TYPE",
+    "ollama_host": "NAT20_OLLAMA_HOST",
+    "ollama_model": "NAT20_OLLAMA_MODEL",
+    "api_base_url": "NAT20_API_BASE_URL",
+    "api_key": "NAT20_API_KEY",
+    "api_model": "NAT20_API_MODEL",
+    "chunk_word_target": "NAT20_CHUNK_WORD_TARGET",
+    "world_context": "NAT20_WORLD_CONTEXT",
+    "world_context_path": "NAT20_WORLD_CONTEXT_PATH",
+    "player_recap_style": "NAT20_PLAYER_RECAP_STYLE",
+    "player_recap_custom_prompt": "NAT20_PLAYER_RECAP_CUSTOM_PROMPT",
+}
+
+
+def merge_campaign_settings_with_env(raw: dict) -> dict:
+    """Priority: env var > DB value > CAMPAIGN_SETTINGS default."""
+    merged = {**CAMPAIGN_SETTINGS}
+    for key, val in raw.items():
+        if val and val.strip():
+            merged[key] = val.strip()
+    for key, env_name in CAMPAIGN_ENV_OVERRIDES.items():
+        val = os.environ.get(env_name)
+        if val is not None:
+            merged[key] = val
+    return merged