Fix individual page system nodes 12812679583942839801 (#43)

* feat: fix individual page configuration to properly display system nodes

- Added `SystemNodeConfig` database table to persist system node config (provider and model).
- Updated `AgentLayout` and `WorkerIndividualSettings` to restrict config modifications to only provider and model for system nodes.
- Hid delete button for system nodes and removed them from the creation modal dropdown.
- Updated Agent API to support querying configured system nodes and persisting setups.

Co-authored-by: zhaoxi826 <198742034+zhaoxi826@users.noreply.github.com>

* feat: fix individual page configuration to properly display system nodes

- Added `SystemNodeConfig` database table to persist system node config (provider and model).
- Updated `AgentLayout` and `WorkerIndividualSettings` to restrict config modifications to only provider and model for system nodes.
- Hid delete button for system nodes and removed them from the creation modal dropdown.
- Updated Agent API to support querying configured system nodes and persisting setups.
- Fixed an issue where the table would not render if only system nodes were present (and no custom workers existed).

Co-authored-by: zhaoxi826 <198742034+zhaoxi826@users.noreply.github.com>

* fix: correct individual worker agent_type and system node model display

- Updated the `agent_type` options in `WorkerIndividualSettings.tsx` to match the backend's expected `AgentType` enum values (`ordinary_individual`, `skill_individual`, `special_individual`). This fixes the 422 error when creating a new worker.
- Fixed the system node provider and model selection logic so it correctly defaults to the first available provider when unconfigured, allowing the model dropdown to populate.

Co-authored-by: zhaoxi826 <198742034+zhaoxi826@users.noreply.github.com>

---------

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
Co-authored-by: zhaoxi826 <198742034+zhaoxi826@users.noreply.github.com>

frontend/src/components/Agent/WorkerIndividualSettings.tsx

@@ -43,14 +43,17 @@ export function WorkerIndividualSettings() {
       const sysNodesData = sysRes.data.system_nodes || [];
       const defaultSysNodes = ['supervisory_node', 'consciousness_node', 'control_node'];
 
+      const providersList = Object.values(provRes.data.provider_list || {}) as Provider[];
+      const defaultProvider = providersList.length > 0 ? providersList[0].provider_title : '';
+
       const formattedSysNodes = defaultSysNodes.map(nodeName => {
         const found = sysNodesData.find((n: any) => n.node_name === nodeName);
         return {
           agent_id: nodeName,
           agent_name: nodeName,
           agent_type: 'System Node',
-          provider_title: found ? found.provider_title : 'Not Configured',
-          model_id: found ? found.model_id : 'Not Configured',
+          provider_title: found && found.provider_title ? found.provider_title : defaultProvider,
+          model_id: found && found.model_id ? found.model_id : '',
           is_system: true
         };
       });
@@ -82,7 +85,7 @@ export function WorkerIndividualSettings() {
   const handleAddNew = () => {
     setEditData({
       agent_name: '',
-      agent_type: 'OrdinaryIndividual',
+      agent_type: 'ordinary_individual',
       description: '',
       provider_title: providers.length > 0 ? providers[0].provider_title : '',
       model_id: '',
@@ -246,14 +249,14 @@ export function WorkerIndividualSettings() {
                 <div>
                   <label className="block text-sm font-medium text-slate-700 mb-1">Agent Type</label>
                   <select
-                    value={editData.agent_type || 'OrdinaryIndividual'}
+                    value={editData.agent_type || 'ordinary_individual'}
                     onChange={(e) => setEditData({...editData, agent_type: e.target.value})}
                     className="w-full px-4 py-2 border border-slate-200 rounded-lg focus:ring-2 focus:ring-indigo-500"
                     disabled={(editData as any).is_system}
                   >
-                    <option value="OrdinaryIndividual">Ordinary Individual</option>
-                    <option value="SkillIndividual">Skill Individual</option>
-                    <option value="SpecialIndividual">Special Individual</option>
+                    <option value="ordinary_individual">Ordinary Individual</option>
+                    <option value="skill_individual">Skill Individual</option>
+                    <option value="special_individual">Special Individual</option>
                     {(editData as any).is_system && (
                       <option value="System Node">System Node</option>
                     )}