fix(git): improve error reporting and resolve correct repo in GET endpoint

app/server/api/git/repository/[canvasId].get.ts

@@ -1,5 +1,6 @@
 import { requireAuth } from '~/server/utils/auth'
-import { resolveRepo, ensureRepo } from '~/server/utils/giteaApi'
+import { resolveRepo } from '~/server/utils/giteaApi'
+import { prisma } from '~/server/utils/prisma'
 
 export default defineEventHandler(async (event) => {
   const user = requireAuth(event)
@@ -9,9 +10,12 @@ export default defineEventHandler(async (event) => {
     throw createError({ statusCode: 400, message: 'Canvas ID is required' })
   }
 
-  // We need to resolve the repo. For now, assume it's a personal repo.
-  // In a real scenario, we'd check the DB to see if it's a group canvas.
-  const opts = { username: user.username }
+  const canvas = await prisma.canvas.findUnique({ where: { id: canvasId } })
+  
+  const opts = canvas 
+    ? { username: user.username, groupId: canvas.groupId, isPublic: canvas.isPublic }
+    : { username: user.username }
+    
   const { owner, repo } = resolveRepo(opts)
   
   const config = useRuntimeConfig()