Pass ServeHeaderOptions by value instead of pointer, fine tune httplib tests

[Copilot]

Pass ServeHeaderOptions by value instead of pointer across all call sites — no nil-check semantics are needed and the struct is small enough that copying is fine.

Changes

• services/context/base.go: SetServeHeaders and ServeContent accept ServeHeaderOptions (value, not pointer); internal unsafe pointer cast replaced with a clean type conversion
• routers/api/packages/helper/helper.go: ServePackageFile variadic changed from ...*context.ServeHeaderOptions to ...context.ServeHeaderOptions; internal variable is now a value type
• All call sites (13 files): &context.ServeHeaderOptions{...} → context.ServeHeaderOptions{...}

Before/after at the definition level:

// Before
func (b *Base) SetServeHeaders(opt *ServeHeaderOptions) { ... }
func (b *Base) ServeContent(r io.ReadSeeker, opts *ServeHeaderOptions) { ... }
func ServePackageFile(..., forceOpts ...*context.ServeHeaderOptions) { ... }

// After
func (b *Base) SetServeHeaders(opts ServeHeaderOptions) { ... }
func (b *Base) ServeContent(r io.ReadSeeker, opts ServeHeaderOptions) { ... }
func ServePackageFile(..., forceOpts ...context.ServeHeaderOptions) { ... }

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