refactor(media): use asset-centric storage key layout

apps/admin/src/app/api/media/upload/route.ts

@@ -1,3 +1,4 @@
+import { randomUUID } from "node:crypto"
 import { hasPermission } from "@cms/content/rbac"
 import { createMediaAsset } from "@cms/db"
 
@@ -57,6 +58,20 @@ function parseTags(formData: FormData): string[] {
     .filter((item) => item.length > 0)
 }
 
+function deriveTitleFromFilename(fileName: string): string {
+  const trimmed = fileName.trim()
+
+  if (!trimmed) {
+    return "Untitled media"
+  }
+
+  const dotIndex = trimmed.lastIndexOf(".")
+  const base = dotIndex > 0 ? trimmed.slice(0, dotIndex) : trimmed
+  const normalized = base.trim()
+
+  return normalized.length > 0 ? normalized : "Untitled media"
+}
+
 function isMimeAllowed(mediaType: string, mimeType: string): boolean {
   const rule = ALLOWED_MIME_BY_TYPE[mediaType]
 
@@ -116,14 +131,9 @@ export async function POST(request: Request): Promise<Response> {
     return badRequest("Invalid form payload.")
   }
 
-  const title = parseTextField(formData, "title")
   const type = parseTextField(formData, "type")
   const fileEntry = formData.get("file")
 
-  if (!title) {
-    return badRequest("Title is required.")
-  }
-
   if (!type) {
     return badRequest("Type is required.")
   }
@@ -146,13 +156,21 @@ export async function POST(request: Request): Promise<Response> {
     return badRequest(`File type ${fileEntry.type || "unknown"} is not allowed for ${type}.`)
   }
 
+  const title = parseTextField(formData, "title") || deriveTitleFromFilename(fileEntry.name)
+  const mediaAssetId = randomUUID()
+  const variant = "original"
+  const fileRole = "original"
+
   try {
     const stored = await storeUpload({
       file: fileEntry,
-      mediaType: type,
+      assetId: mediaAssetId,
+      variant,
+      fileRole,
     })
 
     const created = await createMediaAsset({
+      id: mediaAssetId,
       title,
       type,
       description: parseOptionalField(formData, "description"),
@@ -171,6 +189,7 @@ export async function POST(request: Request): Promise<Response> {
       {
         id: created.id,
         provider: stored.provider,
+        warning: stored.fallbackReason,
         notice: "Media uploaded successfully.",
       },
       { status: 201 },