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feat: replace PNG with WebP for image output (#63)

* feat: replace PNG with WebP for image output

This change transitions the image storage format from PNG to WebP to
leverage better compression. It also generalizes the internal image
processing logic by renaming the package structure.

- Rename `internal/png` to `internal/imageprocessing`.
- Add `github.com/chai2010/webp` dependency for encoding.
- Update `api_server.go` regex and redirects to support `.webp`.
- Refactor `PipelineStage` and processing stages to use the new
  package structure.
- Remove redundant `Bounds` field from the `PngImage` struct,
  calculating it dynamically from the `image.Image` instead.

* refactor: rename PngImage to ProcessedImage

Rename the `PngImage` struct to `ProcessedImage` to better reflect its
role as a generic container within the processing pipeline.

- Update `PipelineStage` interface and all stage implementations.
- Decouple naming from specific image formats.
- Remove `temp.go` development scratchpad.

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