feat(deploy): prompt for service ports at install time; replace hardcoded 5000/5001/5002 with __PORT_*__ placeholders

deploy/setup-step10-creds.sh

@@ -213,7 +213,7 @@ fi
 # ── 5. api-public.json — no prompts, static localhost URL ────────────────────
 if need_cred "api-public"; then
   write_cred "api-public" \
-    '{"Api":{"ContentApiUrl":"http://localhost:5002"}}'
+    "{\"Api\":{\"ContentApiUrl\":\"http://localhost:${PORT_API:-5002}\"}}"
 else
   echo "[setup-step10-creds] api-public.json already exists, skipping"
 fi
@@ -226,7 +226,7 @@ if need_cred "api-manager"; then
     read -rp "  Enter the API key: " API_KEY
   fi
   write_cred "api-manager" \
-    "{\"Api\":{\"ContentApiUrl\":\"http://localhost:5002\",\"ContentApiKey\":\"$(json_escape "${API_KEY}")\"}}"
+    "{\"Api\":{\"ContentApiUrl\":\"http://localhost:${PORT_API:-5002}\",\"ContentApiKey\":\"$(json_escape "${API_KEY}")\"}}"
   unset API_KEY
 else
   echo "[setup-step10-creds] api-manager.json already exists, skipping"