Initial LiteLLM API Gateway Railway template

Multi-service deploy: LiteLLM proxy + PostgreSQL + Redis.
Universal LLM gateway with 100+ provider support.

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

config.yaml

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+model_list:
+  - model_name: gpt-4o
+    litellm_params:
+      model: openai/gpt-4o
+      api_key: os.environ/OPENAI_API_KEY
+  - model_name: gpt-4o-mini
+    litellm_params:
+      model: openai/gpt-4o-mini
+      api_key: os.environ/OPENAI_API_KEY
+  - model_name: claude-sonnet-4-20250514
+    litellm_params:
+      model: anthropic/claude-sonnet-4-20250514
+      api_key: os.environ/ANTHROPIC_API_KEY
+  - model_name: claude-haiku-3.5
+    litellm_params:
+      model: anthropic/claude-3-5-haiku-20241022
+      api_key: os.environ/ANTHROPIC_API_KEY
+
+general_settings:
+  master_key: os.environ/LITELLM_MASTER_KEY
+  database_url: os.environ/DATABASE_URL
+  store_model_in_db: true
+
+litellm_settings:
+  drop_params: true
+  set_verbose: false
+  cache: true
+  cache_params:
+    type: redis
+    host: os.environ/REDIS_HOST
+    port: os.environ/REDIS_PORT
+    password: os.environ/REDIS_PASSWORD