fix: correct broken multisigsApiUrl/proxyApiUrl domains (Android bridge pending-signatures feature)

subquery-multisigs-prod.novasama-tech.org and subquery-proxy-prod.novasama-tech.org
never resolve in DNS - verified via getent/curl. Real upstream (novasamatech/nova-utils
global/config.json) uses subquery-accounts-prod.novasama-tech.org for both. Removed the
Pezkuwi overlay override entirely (it was never meant to diverge from Nova's own
multisig/proxy indexer) and corrected the merged output the Android app actually fetches.

Confirmed impact: the new Bridge Pending Signatures feature (feature-assets
BridgeMultisigInteractor.getPendingApprovals) calls this URL to decode arbitrary
pending multisig call content and silently returns nothing on failure (by design,
to avoid blind-signing) - this was the reason it never showed anything, verified by
submitting a real as_multi call on Polkadot Asset Hub and confirming the on-chain
approval existed but the app rendered nothing until this fix.

pezkuwi-overlay/config/global_config_overlay.json

@@ -1,6 +1,4 @@
 {
-  "multisigsApiUrl": "https://subquery-multisigs-prod.novasama-tech.org",
-  "proxyApiUrl": "https://subquery-proxy-prod.novasama-tech.org",
   "stakingApiOverrides": {
     "https://subquery.pezkuwichain.io": [
       "1aa94987791a5544e9667ec249d2cef1b8fdd6083c85b93fc37892d54a1156ca",

staking/global_config.json

@@ -1,6 +1,6 @@
 {
-  "multisigsApiUrl": "https://subquery-multisigs-prod.novasama-tech.org",
-  "proxyApiUrl": "https://subquery-proxy-prod.novasama-tech.org",
+  "multisigsApiUrl": "https://subquery-accounts-prod.novasama-tech.org/",
+  "proxyApiUrl": "https://subquery-accounts-prod.novasama-tech.org",
   "multiStakingApiUrl": "https://subquery-multi-staking-prod.novasama-tech.org",
   "stakingApiOverrides": {
     "https://subquery.pezkuwichain.io/assethub": [

staking/global_config_dev.json

@@ -1,6 +1,6 @@
 {
-  "multisigsApiUrl": "https://subquery-multisigs-prod.novasama-tech.org",
-  "proxyApiUrl": "https://subquery-proxy-prod.novasama-tech.org",
+  "multisigsApiUrl": "https://subquery-accounts-prod.novasama-tech.org",
+  "proxyApiUrl": "https://subquery-accounts-prod.novasama-tech.org",
   "multiStakingApiUrl": "https://subquery-multi-staking-stg.novasama-tech.org",
   "stakingApiOverrides": {
     "https://subquery.pezkuwichain.io/assethub": [