fix: 修复回流 main 时残留的冲突标记（billing.lua / billing_test.go 取 release/v2.0.x 干净版本）

internal/lua/plugins/billing.lua

@@ -72,8 +72,6 @@ local DEFAULT_PRICES = {
 }
 plugin.prices = DEFAULT_PRICES
 
-<<<<<<< HEAD
-=======
 -- ===== 规则 → 价格表编译（全部在插件内） ==============================
 --
 -- billing 没有任何内核逻辑（issue #1 的方向）：规则文件、编译、计价、账目、
@@ -479,7 +477,6 @@ plugin.http = {
 -- 测试/运维直调导出（/api/plugins/billing/call/...）；不是内核接口。
 plugin.exports = { "rules_get", "rules_put", "rules_add", "rules_delete" }
 
->>>>>>> 7941b41 (refactor(billing)!: 计费全部沉入插件，内核零 billing 代码；规则由插件自持)
 -- Default prompt-cache discount. 0.1 = a cache read costs a tenth of a fresh
 -- token, which is what DeepSeek/Qwen/Kimi and most others charge. It can be
 -- overridden per price entry (prices.models.<m>.cache_discount) or globally by
@@ -597,7 +594,11 @@ local function priceFor(payload)
   -- look the same: an unpriced model silently costing 0 is the most dangerous
   -- failure mode a cost plugin has, because the bill still adds up and just
   -- quietly under-reports. It is counted separately and surfaced in the UI.
-  out = {
+  -- ★ local 是必须的：此前写的是全局 `out = {`，而 priceFor 每个请求都会调用，
+  -- 于是这个表挂在 VM 级全局变量上跨请求残留/泄漏（GitCode issue #1 顺带发现）。
+  -- 功能上因为每次整体重建而侥幸正确，但它是共享可变状态，任何提前 return 或
+  -- 后续分支忘了重建都会让上一单的价格漏到下一单 —— 计费错误不会报错。
+  local out = {
     prompt = d.prompt or 0, completion = d.completion or 0,
     per_request = 0, cache_discount = d.cache_discount, peak = d.peak,
       -- nil = bill reasoning at the completion rate, which is what every
@@ -644,8 +645,6 @@ local function priceFor(payload)
     if kp.cache_discount ~= nil then out.cache_discount = kp.cache_discount end
     if kp.peak ~= nil then out.peak = kp.peak end
   end
-<<<<<<< HEAD
-=======
 
   -- profile 级 default 策略（编译期写入 prices.default_mode）在这里落地：
   -- `free` = 运营声明"没有单独规则的源一律免费" ⇒ 计为已定价（不进 unpriced 统计）；
@@ -656,7 +655,6 @@ local function priceFor(payload)
       out.priced = true
     end
   end
->>>>>>> 7941b41 (refactor(billing)!: 计费全部沉入插件，内核零 billing 代码；规则由插件自持)
   return out
 end