passes: rename mixin classes + patch mixins.json/refmap like OBF

- Remove absorb_mixins keep rule (mixin classes now renameable)
- Add mixins.rs: patch_mixins_json rewrites package + entries via
  common prefix of mapped names; patch_refmap_json rewrites all strings
- Resources pass routes *.mixins.json and *refmap.json to specialized
  patchers, falls back to generic text remap

Reference: OBF fabric-obfuscator patchMixinsJson/patchRefmapJson.

Cargo.lock

@@ -356,6 +356,7 @@ dependencies = [
  "noxis-core",
  "noxis-runtime",
  "noxis-structure-check",
+ "serde_json",
  "thiserror",
  "tracing",
 ]