feat: show_llms_cards_by_provider 添加定价展示 + 优化批量查询

1. get_llms_sort_by_provider: 添加 ppid 批量查询和 pricing_display
2. get_llms_by_catelog: N+1 查询改为批量 ppid 查询，性能优化
3. show_llms_cards_by_provider.ui: 添加 pricing-box 展示区块
4. 两个函数都处理 get_pricing_display 返回 None 的情况

wwwroot/show_llms_cards_by_provider.ui

@@ -25,7 +25,7 @@
 					"options":{
 						"css":"card plaza-card",
 						"cwidth":25,
-						"cheight":12
+						"cheight":16
 					},
 					"subwidgets":[
 						{
@@ -56,6 +56,25 @@
 								"wrap":true,
 								"halign":"left"
 							}
+						},
+						{
+							"widgettype":"Filler",
+							"options":{
+								"css":"pricing-box"
+							},
+							"subwidgets":[
+{% for pricing_text in llm.pricing_display %}
+								{
+									"widgettype":"Text",
+									"options":{
+										"text":{{json.dumps(pricing_text, ensure_ascii=False)}},
+										"wrap":true,
+										"halign":"left",
+										"css":"pricing-text"
+									}
+								}{% if not loop.last %},{% endif %}
+{% endfor %}
+							]
 						}
 					],
 					"binds":[