fix(usage): support CREDIT_LIMIT and multi-interval GLM quotas

GLM quota parsing only accepted TOKENS_LIMIT and wrote every limit to a
single "session" key, so credit-based plans showed nothing and later
intervals overwrote earlier ones. Accept CREDIT_LIMIT too and derive the
quota key from the limit unit (5h session, 7d weekly, tokens, custom).
Moves the parser into its own usage/glm.js, re-exported from misc.js.

open-sse/services/usage/misc.js

@@ -5,11 +5,8 @@
 import { proxyAwareFetch } from "../../utils/proxyFetch.js";
 import { U } from "./shared.js";
 
-// GLM quota endpoints (region-aware) — url from registry transport.usage
-const GLM_QUOTA_URLS = {
-  international: U("glm").url,
-  china: U("glm-cn").url,
-};
+export { getGlmUsage } from "./glm.js";
+
 
 // Vercel AI Gateway credits endpoint
 // Returns { balance: "95.50", total_used: "4.50" } (USD as decimal strings).
@@ -112,63 +109,7 @@ export async function getOllamaUsage(apiKey, providerSpecificData, proxyOptions
   }
 }
 
-/**
- * GLM Coding Plan usage (international + China regions)
- */
-export async function getGlmUsage(apiKey, provider, proxyOptions = null) {
-  if (!apiKey) {
-    return { message: "GLM API key not available." };
-  }
 
-  const region = provider === "glm-cn" ? "china" : "international";
-  const quotaUrl = GLM_QUOTA_URLS[region];
-
-  try {
-    const response = await proxyAwareFetch(quotaUrl, {
-      headers: {
-        Authorization: `Bearer ${apiKey}`,
-        Accept: "application/json",
-      },
-    }, proxyOptions);
-
-    if (!response.ok) {
-      if (response.status === 401) {
-        return { message: "GLM API key invalid or expired." };
-      }
-      return { message: `GLM quota API error (${response.status}).` };
-    }
-
-    const json = await response.json();
-    const data = json?.data && typeof json.data === "object" ? json.data : {};
-    const limits = Array.isArray(data.limits) ? data.limits : [];
-    const quotas = {};
-
-    for (const limit of limits) {
-      if (!limit || limit.type !== "TOKENS_LIMIT") continue;
-      const usedPercent = Number(limit.percentage) || 0;
-      const resetMs = Number(limit.nextResetTime) || 0;
-      const remaining = Math.max(0, 100 - usedPercent);
-
-      quotas["session"] = {
-        used: usedPercent,
-        total: 100,
-        remaining,
-        remainingPercentage: remaining,
-        resetAt: resetMs > 0 ? new Date(resetMs).toISOString() : null,
-        unlimited: false,
-      };
-    }
-
-    const levelRaw = typeof data.level === "string" ? data.level : "";
-    const plan = levelRaw
-      ? levelRaw.charAt(0).toUpperCase() + levelRaw.slice(1).toLowerCase()
-      : "Unknown";
-
-    return { plan, quotas };
-  } catch (error) {
-    return { message: `GLM error: ${error.message}` };
-  }
-}
 
 /**
  * Vercel AI Gateway usage — credit balance for the API key