feat(db,admin): Add logo URL support and refactor bot schema with owner relationships

- Add logo_url column to nodes table for custom branding
- Refactor bots table to use owner_id foreign key relationship with users
- Add is_bot and bot_owner_id columns to users table for bot account tracking
- Add bot_id foreign key to posts table for bot-generated content tracking
- Create database indexes on owner_id, bot_id, is_bot, and bot_owner_id for query performance
- Remove bot handle, bio, avatar_url, and cryptographic keys from bots table (moved to user accounts)
- Update bot_content_sources schema and remove fetch_interval_minutes column
- Fix bot_content_items foreign key constraint with set null on delete
- Remove hardcoded NODE_NAME and NODE_DESCRIPTION from environment configuration
- Update admin panel, bot settings, and layout components to support new schema
- Add AccentColorContext and ToastContext for improved UI state management
- Update PostCard, Sidebar, RightSidebar, and LayoutWrapper components for context integration

drizzle/meta/_journal.json

@@ -15,6 +15,13 @@
       "when": 1769153858324,
       "tag": "0004_add_source_config",
       "breakpoints": true
+    },
+    {
+      "idx": 2,
+      "version": "7",
+      "when": 1769367465905,
+      "tag": "0002_add_logo_url",
+      "breakpoints": true
     }
   ]
 }