Pass ServeHeaderOptions by value instead of pointer, fine tune httplib tests (#36982)

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:
```go
// 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) { ... }
```

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: wxiaoguang <2114189+wxiaoguang@users.noreply.github.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/common/actions.go

@@ -58,7 +58,7 @@ func DownloadActionsRunJobLogs(ctx *context.Base, ctxRepo *repo_model.Repository
 	if p := strings.Index(workflowName, "."); p > 0 {
 		workflowName = workflowName[0:p]
 	}
-	ctx.ServeContent(reader, &context.ServeHeaderOptions{
+	ctx.ServeContent(reader, context.ServeHeaderOptions{
 		Filename:           fmt.Sprintf("%v-%v-%v.log", workflowName, curJob.Name, task.ID),
 		ContentLength:      &task.LogSize,
 		ContentType:        "text/plain; charset=utf-8",