fix(cliproxy): address PR review feedback

- align tier fallback to 'unknown' instead of 'pro' in quota-manager

- update stale comment referencing old allowedTiers approach

src/cliproxy/quota-fetcher.ts

@@ -323,7 +323,7 @@ function mapTierString(tierStr: string | undefined): AccountTier {
 
 /**
  * Get project ID and tier via loadCodeAssist endpoint
- * Uses allowedTiers array with isDefault=true (CLIProxyAPIPlus approach)
+ * Uses paidTier.id for accurate tier detection (g1-ultra-tier, g1-pro-tier)
  */
 async function getProjectId(accessToken: string): Promise<{
   projectId: string | null;

src/cliproxy/quota-manager.ts

@@ -225,7 +225,7 @@ export async function findHealthyAccount(
 
       return {
         id: account.id,
-        tier: account.tier || 'pro',
+        tier: account.tier || 'unknown',
         lastQuota: avgQuota,
       };
     })