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.

crates/noxis-passes/Cargo.toml

@@ -11,6 +11,7 @@ noxis-analysis = { workspace = true }
 noxis-classfile = { workspace = true }
 noxis-core = { workspace = true }
 noxis-runtime = { workspace = true }
+serde_json = { workspace = true }
 thiserror = { workspace = true }
 tracing = { workspace = true }