feat(FN-008): replace RunFusion with OpenCode manifest

- Remove runfusion.yml, add opencode.yml with web terminal config
- Update all references across codebase (tests, docs, specs)
- Add OpenCode container setup with port 3000 and health checks

apps/api/app/tools/manifests/opencode.yml

@@ -1,11 +1,11 @@
-id: runfusion
+id: opencode
-name: RunFusion
+name: OpenCode
-description: Executable Node.js environment for running and developing applications.
+description: AI-powered terminal-based development environment with web interface.
 version: "1.0.0"
-image: node:22-slim
+image: ghcr.io/opencode-ai/opencode:latest
 runtime_working_dir: /workspace
 ports:
-  - container_port: 8080
+  - container_port: 3000
     protocol: tcp
     name: http
     primary: true
@@ -16,31 +16,27 @@ workspace_mounts:
     read_only: false
 config_mounts:
   - type: volume
-    source_pattern: "{user_config}/runfusion"
+    source_pattern: "{user_config}/opencode"
-    target: /home/node/.config
+    target: /root/.config/opencode
     read_only: false
 env:
-  NODE_ENV: development
+  TERM: xterm-256color
+  FORCE_COLOR: "1"
 health_check:
   type: http
   path: /
-  port: 8080
+  port: 3000
   interval_seconds: 10
   timeout_seconds: 5
   retries: 3
-  start_period_seconds: 10
+  start_period_seconds: 15
 resource_limits:
   cpus: 2.0
-  memory_mb: 2048
+  memory_mb: 4096
   memory_swap_mb: -1
-executable:
-  node_version: "22"
-  package_manager: npm
-  bootstrap_commands: []
-  install_commands: []
 traefik:
   enabled: true
-  subdomain_prefix: runfusion
+  subdomain_prefix: opencode
-  port: 8080
+  port: 3000
   middlewares: []
   strip_prefix: false