feat: add the community-funded Homarr assistant provider (#6563)

* Add Homarr provider proxy foundation

* Complete Homarr provider integration

* Harden Homarr provider integration

* Address Homarr provider review feedback

* Address CodeRabbit provider feedback

* Localize provider errors

* Handle provider activity load failures

* docs: improve workshop and homepage

* Harden Homarr provider limits

* fix: harden the Homarr provider

* fix: address provider review feedback

* fix: clarify provider request accounting

* feat: complete the Homarr provider endpoint

* fix: terminate invalid provider streams

packages/workshop/src/schema.ts

@@ -102,6 +102,14 @@ export const workshopUserSchema = z.object({
 });
 export type WorkshopUser = z.infer<typeof workshopUserSchema>;
 
+export const workshopAssistantUsageSchema = z.object({
+  limit: z.number().int().nonnegative(),
+  used: z.number().int().nonnegative(),
+  remaining: z.number().int().nonnegative(),
+  resetsAt: z.iso.datetime({ offset: true }),
+});
+export type WorkshopAssistantUsage = z.infer<typeof workshopAssistantUsageSchema>;
+
 const normalizeWorkshopSubmissionRecord = (value: unknown) => {
   if (typeof value !== "object" || value === null || Array.isArray(value)) return value;
   const record = value as Record<string, unknown>;