Updates the Dropbox integration to store app keys directly in the token file, resolves the issue with the incorrect Dropbox folder path, and searches for images in multiple actual gallery folders instead of a single non-existent one.
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Integrates Dropbox OAuth for authentication, adds API routes for authorization, token exchange, and fetching gallery images, and updates the gallery API to support fetching images directly from Dropbox.
Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 517dfa7b-26ac-463d-a6e1-a58c6df97188
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