refactor: simplify rime proto conversion

[WhiredPlanck]

Pull request

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Fixes # N/A

Feature

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Code of conduct

• CONTRIBUTING

Code style

• make sytle-lint
• Conventional Commits

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• make debug

Manually test

• Done

Code Review

1. No wildcards import
2. Manual build and test pass
3. GitHub Action CI pass
4. At least one contributor review and approve
5. Merged clean without conflicts
6. PR will be merged by rebase upstream base

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Additional Info

[Copilot]

Pull request overview

This PR refactors Trime’s Rime “proto” data flow by removing the old proto.(h|cc) conversion layer and switching JNI↔Kotlin conversions to use the librime C API structs directly, alongside new top-level Kotlin *Proto data classes.

Changes:

• Remove legacy proto.h/proto.cc and replace with lightweight C++ *Proto helper types in helper-types.h.
• Update JNI to build CommitProto/ContextProto/StatusProto from rime->get_*() results and convert them to JVM objects via objconv.h.
• Replace Kotlin usages of nested RimeProto.* types with top-level CommitProto/CompositionProto/MenuProto/StatusProto/ContextProto.

Reviewed changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
app/src/main/jni/librime_jni/rime_jni.cc	Switch JNI output getters to construct new *Proto objects via librime C API and convert to Java objects.
app/src/main/jni/librime_jni/proto.h	Deleted legacy proto model + conversion function declarations.
app/src/main/jni/librime_jni/proto.cc	Deleted legacy conversion implementations using librime internal C++ APIs.
app/src/main/jni/librime_jni/objconv.h	Update object conversion helpers to accept new *Proto C++ types and map to new JVM class names.
app/src/main/jni/librime_jni/jni-utils.h	Update cached JNI class lookups/signatures to use new top-level Kotlin *Proto classes.
app/src/main/jni/librime_jni/helper-types.h	Add new C++ CommitProto/ContextProto/StatusProto etc. built from librime C API structs.
app/src/main/jni/librime_jni/frontend.h / frontend.cc	Extract rime_get_highlighted_candidate_index into a small “frontend” helper.
app/src/main/java/com/osfans/trime/core/RimeProto.kt	Replace class RimeProto { ... } nested types with top-level *Proto data classes.
app/src/main/java/com/osfans/trime/core/RimeMessage.kt	Update message payload types/casts to new *Proto classes.
app/src/main/java/com/osfans/trime/core/RimeApi.kt	Update cached type declarations to new *Proto types.
app/src/main/java/com/osfans/trime/core/Rime.kt	Update external JNI method return types and internal handling to new *Proto types.
app/src/main/java/com/osfans/trime/ime/**.kt (multiple)	Replace imports and parameter types from RimeProto.* to *Proto.

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