chore: add deno.json for new Edge Functions

Required by Supabase deploy to resolve @supabase/functions-js import.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

supabase/functions/collect-channel-data/deno.json

@@ -0,0 +1,5 @@
+{
+  "imports": {
+    "@supabase/functions-js": "jsr:@supabase/functions-js@^2"
+  }
+}

supabase/functions/discover-channels/deno.json

@@ -0,0 +1,5 @@
+{
+  "imports": {
+    "@supabase/functions-js": "jsr:@supabase/functions-js@^2"
+  }
+}