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/bootstrap/bootstrap.go

@@ -3,6 +3,7 @@ package bootstrap
 import (
 	"context"
 	"fmt"
+	"path/filepath"
 	"time"
 
 	"github.com/gin-gonic/gin"
@@ -24,6 +25,7 @@ import (
 	"github.com/geo-platform/tenant-api/internal/shared/response"
 	"github.com/geo-platform/tenant-api/internal/shared/retrieval"
 	"github.com/geo-platform/tenant-api/internal/shared/stream"
+	"github.com/geo-platform/tenant-api/internal/tenant/prompts"
 )
 
 type App struct {
@@ -50,6 +52,7 @@ func New(configPath string) (*App, error) {
 	if err != nil {
 		return nil, fmt.Errorf("load config: %w", err)
 	}
+	prompts.SetConfigFile(filepath.Join(filepath.Dir(configPath), "prompts.yml"))
 
 	logger, err := observability.NewLogger(cfg.Log.Level, cfg.Log.Format)
 	if err != nil {