feat: restructure feature management and update project files

- Introduced a new `package-lock.json` to manage dependencies.
- Removed obsolete `.automaker/feature_list.json` and replaced it with a new structure under `.automaker/features/{id}/feature.json` for better organization.
- Updated various components to utilize the new features API for managing features, including creation, updates, and deletions.
- Enhanced the UI to reflect changes in feature management, including updates to the sidebar and board view.
- Improved documentation and comments throughout the codebase to clarify the new feature management process.

.automaker/app_spec.txt

@@ -42,14 +42,14 @@
     <intelligent_analysis>
       - "Project Ingestion": Analyzes existing codebases to understand structure
       - Auto-generation of `.automaker/app_spec.txt` based on codebase analysis
-      - Auto-generation of `.automaker/feature_list.json`:
+      - Auto-generation of features in `.automaker/features/{id}/feature.json`:
         - Scans code for implemented features
         - Creates test cases for existing features
         - Marks existing features as "passes": true automatically
     </intelligent_analysis>
 
     <kanban_workflow>
-      - Visual representation of `.automaker/feature_list.json`
+      - Visual representation of features from `.automaker/features/` folder
       - Columns: Backlog, Planned, In Progress, Review, Verified (Passed), Failed
       - Drag-and-drop interface to reprioritize tasks
       - direct editing of feature details (steps, description) from the card
@@ -90,7 +90,7 @@
       - Sidebar: Project List, Settings, Logs, Plugins
       - Main Content:
         - **Spec View**: Split editor for `.automaker/app_spec.txt`
-        - **Board View**: Kanban board for `.automaker/feature_list.json`
+        - **Board View**: Kanban board for `.automaker/features/` folder
         - **Code View**: Read-only Monaco editor to see what the agent is writing
         - **Agent View**: Chat-like interface showing agent thought process and tool usage. Also used for the "New Project Interview".
     </window_structure>
@@ -123,7 +123,7 @@
     </phase_2_core_logic>
     <phase_3_kanban_and_interaction>
       - Build Kanban board with drag-and-drop
-      - Connect Kanban state to `.automaker/feature_list.json` filesystem
+      - Connect Kanban state to `.automaker/features/` filesystem
       - Implement "Run Feature" capability
       - Integrate standard prompts library
     </phase_3_kanban_and_interaction>