Fix CI: use npm install instead of npm ci

The lint-and-typecheck job was using npm ci which requires
package-lock.json to be in sync. Changed to npm install for
Prisma 7 upgrade compatibility.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitea/workflows/build.yml

@@ -29,7 +29,7 @@ jobs:
           node-version: '20'
 
       - name: Install dependencies
-        run: npm ci
+        run: npm install
 
       - name: Generate Prisma client
         run: npx prisma generate