Fix Docker build: add .npmrc for Tremor peer dep conflict

@tremor/react@3.18.7 requires react@^18 but project uses react@19.
Adding .npmrc with legacy-peer-deps=true and copying it in Dockerfiles
so npm ci resolves correctly. Also fix implicit any in seed file.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

prisma/seed-expertise-tags.ts

@@ -131,7 +131,7 @@ async function main() {
   const existingTags = await prisma.expertiseTag.findMany({
     select: { name: true },
   })
-  const existingNames = new Set(existingTags.map((t) => t.name))
+  const existingNames = new Set(existingTags.map((t: { name: string }) => t.name))
 
   // Filter out tags that already exist
   const newTags = EXPERTISE_TAGS.filter((t) => !existingNames.has(t.name))