🚀 perf: optimize model management APIs, unify pricing types as array, and remove redundancies

Backend
- Add GetBoundChannelsByModelsMap to batch-fetch bound channels via a single JOIN (Distinct), compatible with SQLite/MySQL/PostgreSQL
- Replace per-record enrichment with a single-pass enrichModels to avoid N+1 queries; compute unions for prefix/suffix/contains matches in memory
- Change Model.QuotaType to QuotaTypes []int and expose quota_types in responses
- Add GetModelQuotaTypes for cached O(1) lookups; exact models return a single-element array
- Sort quota_types for stable output order
- Remove unused code: GetModelByName, GetBoundChannels, GetBoundChannelsForModels, FindModelByNameWithRule, buildPrefixes, buildSuffixes
- Clean up redundant comments, keeping concise and readable code

Frontend
- Models table: switch to quota_types, render multiple billing modes ([0], [1], [0,1], future values supported)
- Pricing table: switch to quota_types; ratio display now checks quota_types.includes(0); array rendering for billing tags

Compatibility
- SQL uses standard JOIN/IN/Distinct; works across SQLite/MySQL/PostgreSQL
- Lint passes; no DB schema changes (quota_types is a JSON response field only)

Breaking Change
- API field renamed: quota_type -> quota_types (array). Update clients accordingly.

web/src/components/table/models/ModelsColumnDefs.js

@@ -121,24 +121,36 @@ const renderEndpoints = (value) => {
   }
 };
 
-// Render quota type
-const renderQuotaType = (qt, t) => {
-  if (qt === 1) {
+// Render quota types (array)
+const renderQuotaTypes = (arr, t) => {
+  if (!Array.isArray(arr) || arr.length === 0) return '-';
+  const renderOne = (qt, idx) => {
+    if (qt === 1) {
+      return (
+        <Tag key={`${qt}-${idx}`} color='teal' size='small' shape='circle'>
+          {t('按次计费')}
+        </Tag>
+      );
+    }
+    if (qt === 0) {
+      return (
+        <Tag key={`${qt}-${idx}`} color='violet' size='small' shape='circle'>
+          {t('按量计费')}
+        </Tag>
+      );
+    }
+    // 未来新增模式的兜底展示
     return (
-      <Tag color='teal' size='small' shape='circle'>
-        {t('按次计费')}
+      <Tag key={`${qt}-${idx}`} color='white' size='small' shape='circle'>
+        {qt}
       </Tag>
     );
-  }
-  if (qt === 0) {
-    return (
-      <Tag color='violet' size='small' shape='circle'>
-        {t('按量计费')}
-      </Tag>
-    );
-  }
-  // 未知
-  return '-';
+  };
+  return (
+    <Space wrap>
+      {arr.map((qt, idx) => renderOne(qt, idx))}
+    </Space>
+  );
 };
 
 // Render bound channels
@@ -303,8 +315,8 @@ export const getModelsColumns = ({
     },
     {
       title: t('计费类型'),
-      dataIndex: 'quota_type',
-      render: (qt) => renderQuotaType(qt, t),
+      dataIndex: 'quota_types',
+      render: (qts) => renderQuotaTypes(qts, t),
     },
     {
       title: t('创建时间'),