feat(tool-config): add categories, interfaces, and config management

Add support for tool categories, interface types, and per-tool configuration.

Backend:
- Add category and interfaces fields to ToolType model
- Create ToolConfig model for storing tool-specific settings
- Add tool_configs API endpoints (CRUD)
- Update built-in tool types with categories and interfaces:
  - code-server: editor, [web]
  - jupyter-notebook: notebook, [web]
  - opencode: ai-assistant, [terminal]
- Update instance API to include tool type interfaces
- Create Alembic migrations 0008 and 0009

Frontend:
- Update ToolType and Session interfaces with new fields
- Conditionally show Open/Terminal buttons based on tool interfaces
- Add API client for tool configs

OpenSpec: tool-config-management change created and implemented.

apps/api/src/main.py

@@ -16,6 +16,7 @@ from src.api.projects import router as projects_router
 from src.api.ssh_keys import router as ssh_keys_router
 from src.api.terminal import router as terminal_router
 from src.api.instance_proxy import router as instance_proxy_router
+from src.api.tool_configs import router as tool_configs_router
 from src.api.tool_instances import router as tool_instances_router
 from src.api.tool_instances import sessions_router
 from src.api.tool_types import router as tool_types_router
@@ -106,6 +107,8 @@ async def seed_builtin_tool_types():
                 "name": "code-server",
                 "display_name": "VS Code Server",
                 "description": "VS Code running in the browser via code-server",
+                "category": "editor",
+                "interfaces": ["web"],
                 "compose_template": """version: "3.8"
 services:
   code-server:
@@ -126,6 +129,8 @@ services:
                 "name": "jupyter-notebook",
                 "display_name": "Jupyter Notebook",
                 "description": "Jupyter Lab for interactive development",
+                "category": "notebook",
+                "interfaces": ["web"],
                 "compose_template": """version: "3.8"
 services:
   jupyter:
@@ -140,6 +145,35 @@ services:
     restart: unless-stopped""",
                 "required_variables": ["REPO_PATH", "TOOL_NAME"],
             },
+            {
+                "name": "opencode",
+                "display_name": "OpenCode",
+                "description": "AI coding assistant in the terminal",
+                "category": "ai-assistant",
+                "interfaces": ["terminal"],
+                "compose_template": """version: "3.8"
+services:
+  opencode:
+    image: node:20-slim
+    container_name: {{TOOL_NAME}}
+    working_dir: /workspace
+    environment:
+      - HOME=/tmp
+    volumes:
+      - {{REPO_PATH}}:/workspace
+      - opencode_home:/tmp
+    command: >
+      sh -c "npm install -g opencode@latest &&
+             mkdir -p /workspace &&
+             tail -f /dev/null"
+    stdin_open: true
+    tty: true
+    restart: unless-stopped
+
+volumes:
+  opencode_home:""",
+                "required_variables": ["REPO_PATH", "TOOL_NAME"],
+            },
         ]
 
         for tool_data in builtin_types:
@@ -149,6 +183,8 @@ services:
                     name=tool_data["name"],
                     display_name=tool_data["display_name"],
                     description=tool_data["description"],
+                    category=tool_data["category"],
+                    interfaces=tool_data["interfaces"],
                     compose_template=tool_data["compose_template"],
                     required_variables=tool_data["required_variables"],
                     is_builtin=True,
@@ -184,6 +220,7 @@ app.include_router(git_repositories_router)
 app.include_router(user_config_router)
 app.include_router(tool_types_router)
 app.include_router(tool_instances_router)
+app.include_router(tool_configs_router)
 app.include_router(sessions_router)
 app.include_router(instance_proxy_router)
 app.include_router(terminal_router)