feat(ui): Add setup wizard and improve initial load experience

Add setup wizard view with multi-step flow for first-time server
configuration. Show animated logo during initial load instead of
blank page. Populate sidebar nav counts from /stats API.

Signed-off-by: nfebe <fenn25.fn@gmail.com>

Author: nfebe

.env.production

@@ -0,0 +1 @@
+VITE_API_URL=/api

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '22'
           cache: 'npm'
 
       - name: Install dependencies
@@ -37,7 +37,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '22'
           cache: 'npm'
 
       - name: Install dependencies
@@ -55,7 +55,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '22'
           cache: 'npm'
 
       - name: Install dependencies
@@ -74,7 +74,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '22'
           cache: 'npm'
 
       - name: Install dependencies