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

src/app/api/admin/node/route.ts

@@ -23,6 +23,7 @@ export async function PATCH(req: NextRequest) {
                 longDescription: data.longDescription,
                 rules: data.rules,
                 bannerUrl: data.bannerUrl,
+                logoUrl: data.logoUrl,
                 accentColor: data.accentColor,
             }).returning();
         } else {
@@ -33,6 +34,7 @@ export async function PATCH(req: NextRequest) {
                     longDescription: data.longDescription,
                     rules: data.rules,
                     bannerUrl: data.bannerUrl,
+                    logoUrl: data.logoUrl,
                     accentColor: data.accentColor,
                     updatedAt: new Date(),
                 })