feat(nodejs): upgrade napi-rs from v2 to v3 (#3057)

## Summary

- Upgrades `@napi-rs/cli` from v2 to v3, `napi`/`napi-derive` Rust
crates to 3.x
- Fixes a bug
([napi-rs#1170](https://github.com/napi-rs/napi-rs/issues/1170)) where
the CLI failed to locate the built `.node` binary when a custom Cargo
target directory is set (via `config.toml`)

## Changes

**package.json / CLI**:
- `napi.name` → `napi.binaryName`, `napi.triples` → `napi.targets`
- Removed `--no-const-enum` flag and fixed output dir arg
- `napi universal` → `napi universalize`

**Rust API migration**:
- `#[napi::module_init]` → `#[napi_derive::module_init]`
- `napi::JsObject` → `Object`, `.get::<_, T>()` → `.get::<T>()`
- `ErrorStrategy` removed; `ThreadsafeFunction` now takes an explicit
`Return` type with `CalleeHandled = false` const generic
- `JsFunction` + `create_threadsafe_function` replaced by typed
`Function<Args, Return>` + `build_threadsafe_function().build()`
- `RerankerCallbacks` struct removed (`Function<'env,...>` can't be
stored in structs); `VectorQuery::rerank` now accepts the function
directly
- `ClassInstance::clone()` now returns `ClassInstance`, fixed with
explicit deref
- `Vec<u8>` in `#[napi(object)]` now maps to `Array<number>` in v3;
changed to `Buffer` to preserve the TypeScript `Buffer` type

**TypeScript**:
- `inner.rerank({ rerankHybrid: async (_, args) => ... })` →
`inner.rerank(async (args) => ...)`
- Header provider callback wrapped in `async` to match stricter typed
constructor signature

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/nodejs.yml

@@ -78,8 +78,11 @@ jobs:
         fetch-depth: 0
         lfs: true
     - uses: actions/setup-node@v3
+      name: Setup Node.js 20 for build
       with:
-        node-version: ${{ matrix.node-version }}
+        # @napi-rs/cli v3 requires Node >= 20.12 (via @inquirer/prompts@8).
+        # Build always on Node 20; tests run on the matrix version below.
+        node-version: 20
         cache: 'npm'
         cache-dependency-path: nodejs/package-lock.json
     - uses: Swatinem/rust-cache@v2
@@ -87,12 +90,16 @@ jobs:
       run: |
         sudo apt update
         sudo apt install -y protobuf-compiler libssl-dev
-        npm install -g @napi-rs/cli
     - name: Build
       run: |
         npm ci --include=optional
         npm run build:debug -- --profile ci
-        npm run tsc
+    - uses: actions/setup-node@v3
+      name: Setup Node.js ${{ matrix.node-version }} for test
+      with:
+        node-version: ${{ matrix.node-version }}
+    - name: Compile TypeScript
+      run: npm run tsc
     - name: Setup localstack
       working-directory: .
       run: docker compose up --detach --wait
@@ -145,7 +152,6 @@ jobs:
     - name: Install dependencies
       run: |
         brew install protobuf
-        npm install -g @napi-rs/cli
     - name: Build
       run: |
         npm ci --include=optional