chore: enable forcetypeassert linter, fix issues (#38804)

Enable [`forcetypeassert`](https://github.com/gostaticanalysis/forcetypeassert)
linter to prevent unchecked type assertions. ~650 issues fixed, most
fixes were clean, some use `setting.PanicInDevOrTesting`.

The only behaviour changes are where code would previously send a 500 error
or panic, a 4xx error is now emitted.

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

services/context/api.go

@@ -20,6 +20,7 @@ import (
 	"gitea.dev/modules/git"
 	"gitea.dev/modules/httpcache"
 	"gitea.dev/modules/log"
+	"gitea.dev/modules/reqctx"
 	"gitea.dev/modules/setting"
 	"gitea.dev/modules/util"
 	"gitea.dev/modules/web"
@@ -56,7 +57,7 @@ func (ctx *APIContext) TokenCanAccessRepo(repo *repo_model.Repository) bool {
 
 func init() {
 	web.RegisterResponseStatusProvider[*APIContext](func(req *http.Request) web_types.ResponseStatusProvider {
-		return req.Context().Value(apiContextKey).(*APIContext)
+		return GetAPIContext(req)
 	})
 }
 
@@ -185,7 +186,7 @@ var apiContextKey = apiContextKeyType{}
 
 // GetAPIContext returns a context for API routes
 func GetAPIContext(req *http.Request) *APIContext {
-	return req.Context().Value(apiContextKey).(*APIContext)
+	return reqctx.MustContextValue[*APIContext](req.Context(), apiContextKey)
 }
 
 func genAPILinks(curURL *url.URL, total int64, pageSize, curPage int) []string {