fix: move akto plugin under src/plugins so its imports resolve

[AnayGarodia]

Fixes #1674

On the 2.0.0 branch the akto plugin lives at the repo-root plugins/akto/, but src/plugins/index.ts imports it as ./akto/scan and its own sources import ../types and ../utils. Those relative imports only resolve under src/plugins/ (which is where types.ts and utils.ts live), so on a clean checkout rollup cannot resolve the akto module and docker build fails.

This moves plugins/akto/ to src/plugins/akto/ (a plain git mv, no code changes) so src/plugins/index.ts's ./akto/scan import and akto's ../types / ../utils imports all resolve, matching every other plugin under src/plugins/. The existing scan.test.ts moves with it and now sits alongside the code it tests.

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