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.js

@@ -15,10 +15,10 @@ import { getGrokCliUsage } from "./usage/grok-cli.js";
 import { getKimiUsage } from "./usage/kimi.js";
 import { getDeepseekUsage } from "./usage/deepseek.js";
 import { resolveQoderCredentials } from "./qoderModels.js";
+import { getGlmUsage } from "./usage/glm.js";
 import {
   getIflowUsage,
   getOllamaUsage,
-  getGlmUsage,
   getVercelAiGatewayUsage,
   getQoderUsage,
 } from "./usage/misc.js";