feat(prompts): add prompts loader and configuration management

- Implemented a new prompts loader in `loader.go` to manage prompt templates and configurations.
- Introduced caching mechanism for prompt configurations to optimize loading.
- Added functions to apply platform-specific prompt template overrides.
- Created unit tests in `loader_test.go` to validate prompt configuration loading and reloading behavior.
- Ensured that the last valid configuration is retained in case of errors during reload.

server/internal/tenant/app/template_prompt_test.go

@@ -3,6 +3,8 @@ package app
 import (
 	"strings"
 	"testing"
+
+	"github.com/geo-platform/tenant-api/internal/tenant/prompts"
 )
 
 func TestBuildPromptContextUsesChineseLabels(t *testing.T) {
@@ -45,7 +47,8 @@ func TestBuildGenerationLengthGuidanceForEnglishLocaleIsWrittenInChinese(t *test
 }
 
 func TestBuildGenerationPromptAddsTopXBrandPriorityRules(t *testing.T) {
-	prompt := buildGenerationPrompt("top_x_article", "Top X 推荐文章", nil, map[string]interface{}{
+	promptTemplate, _ := prompts.ApplyPlatformTemplatePromptOverrides("top_x_article", nil, []byte(`{}`))
+	prompt := buildGenerationPrompt("top_x_article", "Top X 推荐文章", promptTemplate, map[string]interface{}{
 		"topic":      "合肥全屋定制",
 		"brand_name": "安徽海翔家居用品销售有限公司",
 		"locale":     "zh-CN",
@@ -54,14 +57,54 @@ func TestBuildGenerationPromptAddsTopXBrandPriorityRules(t *testing.T) {
 	for _, expected := range []string{
 		"模板专项要求:",
 		"安徽海翔家居用品销售有限公司",
-		"排在第 1 位",
-		"篇幅应明显多于其他对象",
-		"结论部分先明确推荐",
+		"首个重点分析章节",
+		"顺序不代表评价或排名",
+		"不得表述为第一名",
+		"必须把其一级节点逐一写成正文 H2 小标题",
+		"严格按给定顺序展开",
 	} {
 		if !strings.Contains(prompt, expected) {
 			t.Fatalf("buildGenerationPrompt() = %q, want %q", prompt, expected)
 		}
 	}
+
+	for _, unexpected := range []string{
+		"排在第 1 位",
+		"主推对象",
+	} {
+		if strings.Contains(prompt, unexpected) {
+			t.Fatalf("buildGenerationPrompt() = %q, should not contain legacy ranking copy %q", prompt, unexpected)
+		}
+	}
+}
+
+func TestBuildGenerationPromptTopXRepeatsOutlineExecutionRulesInBasePrompt(t *testing.T) {
+	promptTemplate, _ := prompts.ApplyPlatformTemplatePromptOverrides("top_x_article", nil, []byte(`{}`))
+	prompt := buildGenerationPrompt("top_x_article", "Top X 推荐文章", promptTemplate, map[string]interface{}{
+		"topic":  "合肥全屋定制",
+		"locale": "zh-CN",
+		"article_outline": []interface{}{
+			map[string]interface{}{
+				"outline": "行业现状与选择思路",
+				"children": []interface{}{
+					map[string]interface{}{"outline": "当前需求变化"},
+				},
+			},
+			map[string]interface{}{"outline": "品牌观察"},
+			map[string]interface{}{"outline": "总结建议"},
+		},
+	}, "")
+
+	for _, expected := range []string{
+		"如当前上下文提供了 article_outline",
+		"不得调换、合并、跳过",
+		"不要自行新增同级章节",
+		"不要另起一套脱离大纲的总结结构",
+	} {
+		if !strings.Contains(prompt, expected) {
+			t.Fatalf("buildGenerationPrompt() = %q, want outline execution rule %q", prompt, expected)
+		}
+	}
 }
 
 func TestBuildGenerationPromptDoesNotAddTopXBrandRulesForOtherTemplates(t *testing.T) {
@@ -70,7 +113,7 @@ func TestBuildGenerationPromptDoesNotAddTopXBrandRulesForOtherTemplates(t *testi
 		"brand_name":   "安徽海翔家居用品销售有限公司",
 	}, "")
 
-	if strings.Contains(prompt, "排在第 1 位") {
+	if strings.Contains(prompt, "首个重点分析章节") {
 		t.Fatalf("buildGenerationPrompt() = %q, should not include top-x ranking rules", prompt)
 	}
 }