fix: resolve creator lightning address via two-step API lookup

The /filmmakers/project/:id/owner endpoint returns a FilmmakerDTO
which doesn't include lightningAddress. Now correctly fetches the
owner's filmmaker ID first, then calls /filmmakers/:id/lightning-address
to get their actual lightning address for zap invoice generation.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/components/ZapModal.vue

@@ -238,28 +238,35 @@ watch(() => props.isOpen, async (open) => {
 /**
  * Resolve the content creator's lightning address via the backend,
  * then fetch the LNURL-pay endpoint for invoice generation.
+ *
+ * Two-step lookup:
+ *  1. GET /filmmakers/project/:id/owner → { id, professionalName }
+ *  2. GET /filmmakers/:id/lightning-address → { lightningAddress }
  */
 async function resolveLightningAddress() {
   if (!props.content) return
 
   try {
-    // Get the project owner's lightning address from the backend
+    // Step 1: Get the project owner's filmmaker profile
     const projectId = props.content.id
     const ownerData = await indeehubApiService.get<{
       id: string
       professionalName?: string
-      lightningAddress?: string
     }>(`/filmmakers/project/${projectId}/owner`)
 
-    if (ownerData?.professionalName) {
+    if (!ownerData?.id) return
+
+    if (ownerData.professionalName) {
       creatorName.value = ownerData.professionalName
     }
 
-    const lightningAddress = ownerData?.lightningAddress
-    if (!lightningAddress) {
-      // No lightning address on the owner, try fetching from payment methods
-      return
-    }
+    // Step 2: Fetch the filmmaker's lightning address
+    const addressData = await indeehubApiService.get<{
+      lightningAddress: string
+    }>(`/filmmakers/${ownerData.id}/lightning-address`)
+
+    const lightningAddress = addressData?.lightningAddress
+    if (!lightningAddress) return
 
     // Parse lightning address: user@domain → https://domain/.well-known/lnurlp/user
     const [username, domain] = lightningAddress.split('@')