refactor(core): decouple actors and remove workflow templates (#67)

Removes the deprecated `workflow_template` concept entirely across both backend API routers, internal logic handling within the `supervisory_node` and `consciousness_node`, and front-end components. Enables `consciousness_node` to work autonomously.

Also refactors core package structure to enforce the "one python package, one Ray Actor" architectural rule. `GlobalWorkflowManager`, `WorkflowRunningEngine`, `PostgresDatabase`, and `WorkerCluster` have been moved to their own top-level decoupled package directories with properly exported `__init__.py` modules. Test suites have been relocated and import paths updated across the system.

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/Plugin/PluginLayout.tsx

@@ -1,6 +1,5 @@
 import { SkillSettings } from './SkillSettings';
 import { ToolSettings } from './ToolSettings';
-import { WorkflowTemplateSettings } from './WorkflowTemplateSettings';
 
 interface PluginLayoutProps {
   resourceTab: string;
@@ -20,14 +19,6 @@ export function PluginLayout({ resourceTab, setResourceTab }: PluginLayoutProps)
         >
           Skills
         </button>
-        <button
-          onClick={() => setResourceTab('workflow_template')}
-          className={`py-4 text-sm font-medium border-b-2 transition-colors ${
-            resourceTab === 'workflow_template' ? 'border-blue-600 text-blue-600' : 'border-transparent text-slate-500 hover:text-slate-800'
-          }`}
-        >
-          Workflow Templates
-        </button>
         <button
           onClick={() => setResourceTab('tool')}
           className={`py-4 text-sm font-medium border-b-2 transition-colors ${
@@ -41,7 +32,6 @@ export function PluginLayout({ resourceTab, setResourceTab }: PluginLayoutProps)
       {/* Main Content */}
       <div className="flex-1 overflow-y-auto p-8">
         {resourceTab === 'skill' && <SkillSettings />}
-        {resourceTab === 'workflow_template' && <WorkflowTemplateSettings />}
         {resourceTab === 'tool' && <ToolSettings />}
       </div>
     </div>