chore: initial snapshot for gitea/github upload

llm-gateway-competitors/sub2api-tar/backend/internal/service/token_cache_key.go

@@ -0,0 +1,15 @@
+package service
+
+import "strconv"
+
+// OpenAITokenCacheKey 生成 OpenAI OAuth 账号的缓存键
+// 格式: "openai:account:{account_id}"
+func OpenAITokenCacheKey(account *Account) string {
+	return "openai:account:" + strconv.FormatInt(account.ID, 10)
+}
+
+// ClaudeTokenCacheKey 生成 Claude (Anthropic) OAuth 账号的缓存键
+// 格式: "claude:account:{account_id}"
+func ClaudeTokenCacheKey(account *Account) string {
+	return "claude:account:" + strconv.FormatInt(account.ID, 10)
+}