fix: file-type dep mismatch version on node_modules override

[aleortega]

Description

The GET /content/contents/:id endpoint was failing on most requests with:

TypeError: buf.readInt32BE is not a function
      at Object.get
  (node_modules/file-type/node_modules/token-types/lib/index.js:156:20)

Root cause:
The Dockerfile merges dependencies by copying content/node_modules/ into the root node_modules/. This overlay replaces file-type@15 (a root workspace dependency) with file-type@21 (content's dependency), but leaves behind the stale nested node_modules/file-type/node_modules/token-types@2.1.1 from the old version. At runtime, file-type@21 resolves token-types to this stale v2.1.1 (CJS, uses Buffer.readInt32BE) instead of the correct v6.1.1 (ESM, uses DataView with Uint8Array), causing the crash.

Fix:
Remove file-type@15 from root node_modules/ before overlaying content's dependencies, ensuring file-type@21 is installed cleanly without stale nested dependencies