Update devcontainer and Docker setup with new LLM API configuration

Update devcontainer.json to set terminal shell and add empty features object
Update docker-compose.yml to change port mapping and add environment variable for LOCAL_LLM_API
Add new OpenCode configuration files for LLM settings and instructions
Update Dockerfile to install additional tools and dependencies including Go, Rust, Node.js, and Python packages
Modify docker-entrypoint.sh to handle MCP server initialization and shell configuration
Update LM client readme to reflect new API endpoint configuration

.opencode/config.json

@@ -0,0 +1,8 @@
+{
+    "llm": {
+        "provider": "openai",
+        "model": "default",
+        "apiKey": "not-needed",
+        "baseURL": "${LOCAL_LLM_API:-http://host.docker.internal:1248/v1}"
+    }
+}