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/transport/monitoring_handler.go

@@ -2,6 +2,7 @@ package transport
 
 import (
 	"strconv"
+	"strings"
 
 	"github.com/gin-gonic/gin"
 
@@ -43,7 +44,9 @@ func (h *MonitoringHandler) DashboardComposite(c *gin.Context) {
 		return
 	}
 
-	data, svcErr := h.svc.DashboardComposite(c.Request.Context(), brandID, keywordID, days, c.Query("business_date"))
+	aiPlatformID := parseOptionalStringPointer(c.Query("ai_platform_id"))
+
+	data, svcErr := h.svc.DashboardComposite(c.Request.Context(), brandID, keywordID, days, c.Query("business_date"), aiPlatformID)
 	if svcErr != nil {
 		response.Error(c, svcErr)
 		return
@@ -64,11 +67,7 @@ func (h *MonitoringHandler) QuestionDetail(c *gin.Context) {
 		return
 	}
 
-	var aiPlatformID *string
-	if value := c.Query("ai_platform_id"); value != "" {
-		trimmed := value
-		aiPlatformID = &trimmed
-	}
+	aiPlatformID := parseOptionalStringPointer(c.Query("ai_platform_id"))
 
 	data, svcErr := h.svc.QuestionDetail(
 		c.Request.Context(),
@@ -131,3 +130,12 @@ func parseOptionalInt(raw string) (int, error) {
 	}
 	return strconv.Atoi(raw)
 }
+
+func parseOptionalStringPointer(raw string) *string {
+	trimmed := strings.TrimSpace(raw)
+	if trimmed == "" {
+		return nil
+	}
+	value := trimmed
+	return &value
+}