Rewrite API

[RagingLink]

Must have:

• Rework the typing/schema system for operations/data
• Operation caching
• Improve caching system and add dynamic clearing of image buffers (not only clear after x hours, but also if the API is storing a ton of images it should free up memory more often)

Nice to have:

• Better 'main' route instead of what api.ts currently is, fastify?
• GIF support
• Canvas support for drawing basic shapes, text, etc.
• Integration with something like imgur/imgbb so the reliance on storing on the FS is less (if not completely removed tbh)
• Rate-limiting
• Fully get rid of the copy pasted code for mapping input objects
• Docs update to use the types as used in code (should be easier with the typebox schemas)

Misc operation support maybe:

• Sharpen
• Blur
• Boolean
• Negate
• Normalize
• Extend
• Tint
• Greyscale
• extractChannel()