chore(docker): update environment variable prefixes to AMCS

llm/plan.md

@@ -515,16 +515,16 @@ type OpenRouterAIConfig struct {
 ### Order
 
 1. `--config /path/to/file.yaml`
-2. `OB1_CONFIG`
+2. `AMCS_CONFIG`
 3. default `./configs/dev.yaml`
 4. environment overrides for specific fields
 
 ### Suggested env overrides
 
-* `OB1_DATABASE_URL`
-* `OB1_LITELLM_API_KEY`
-* `OB1_OPENROUTER_API_KEY`
-* `OB1_SERVER_PORT`
+* `AMCS_DATABASE_URL`
+* `AMCS_LITELLM_API_KEY`
+* `AMCS_OPENROUTER_API_KEY`
+* `AMCS_SERVER_PORT`
 
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