fix(deploy): embed prisma migrate deploy in API startup

- Move prisma to runtime dependencies so it's available in prod image
- API runs migrate deploy before starting (handles fresh installs + updates)
- Remove separate migrate service from prod compose

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

pnpm-lock.yaml

@@ -101,6 +101,9 @@ importers:
       pdf-parse:
         specifier: ^2.4.5
         version: 2.4.5
+      prisma:
+        specifier: ^6.0.0
+        version: 6.19.3(typescript@5.9.3)
       reflect-metadata:
         specifier: ^0.2.0
         version: 0.2.2
@@ -135,9 +138,6 @@ importers:
       '@types/passport-local':
         specifier: ^1.0.38
         version: 1.0.38
-      prisma:
-        specifier: ^6.0.0
-        version: 6.19.3(typescript@5.9.3)
       typescript:
         specifier: ^5.5.0
         version: 5.9.3