fix(partial): handle FactoryTarget::Service in partial factory emit

[brandonroberts]

Summary

Fixes a build break on main after #324 (@Service decorator AOT) and #325 (partial-declaration emit) landed sequentially.

#324 added a new FactoryTarget::Service enum variant. #325 added the partial factory emitter with an exhaustive match on FactoryTarget. Each PR passed CI on its own branch, but the new variant wasn't added to the match in the partial emitter — so cargo build on main now fails:

error[E0004]: non-exhaustive patterns: `FactoryTarget::Service` not covered
  --> crates/oxc_angular_compiler/src/partial/factory.rs:173:25

Fix

Group Service with Injectable in the partial-emit match. At runtime, Service factories use the same ɵɵinject token path as Injectable — factory/compiler.rs:664 already groups them in the full-mode dispatch — so the partial declaration's target: i0.ɵɵFactoryTarget.Injectable produces the correct linked factory.

- FactoryTarget::Injectable => "Injectable",
+ FactoryTarget::Injectable | FactoryTarget::Service => "Injectable",

Test plan

• cargo build -p oxc_angular_compiler — clean
• cargo test -p oxc_angular_compiler — 2689 passed, 0 failed
• pnpm build (full native + tsc) — clean
• When @Service AOT gains its own partial-emit slice with a proper ɵɵngDeclareService shape, swap the match arm to a dedicated "Service" variant and add a FactoryTarget::Service test fixture.

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