fix: embed time/tzdata so time.LoadLocation works in Alpine container

Alpine doesn't ship the IANA timezone database, causing
time.LoadLocation('America/New_York') to fail with 'Invalid timezone'
for every non-UTC option in the profile settings dropdown.

cmd/server/main.go

@@ -14,6 +14,8 @@ import (
 	"log"
 	"time"
 
+	_ "time/tzdata"
+
 	"github.com/go-playground/validator/v10"
 	"github.com/jackc/pgx/v5/pgxpool"
 	"github.com/labstack/echo/v5"