fix: replace deprecated reverse proxy director

[Soner (shyim)]

Summary

• replace deprecated ReverseProxy.Director usage in the image proxy with ReverseProxy.Rewrite
• move image proxy reverse proxy setup into a shared helper for command and tests
• remove the ignored staticcheck deprecation suppressions

Testing

• go test ./cmd/project
• golangci-lint run
• go test ./...

[chatgpt-codex-connector]

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Reviewed commit: 944a723eb7

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[chatgpt-codex-connector]

Preserve raw queries when using Rewrite

For requests whose image URL contains query parameters that Go considers unparsable, such as semicolon-separated transform options (/img.svg?w=100;h=100&fmt=webp) or a literal bad escape, ReverseProxy cleans req.Out.URL.RawQuery before invoking Rewrite; SetURL then forwards only the cleaned query. The old Director path preserved the raw query unchanged, so these requests now reach the upstream with parameters silently dropped unless req.In.URL.RawQuery is restored after rewriting.

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[Soner (shyim)]

Addressed the review comment by restoring the inbound raw query after SetURL, preserving upstream base queries, and added a regression test for semicolon-separated query params. Re-ran go test ./cmd/project, golangci-lint run, and go test ./....