refactor: rename Go module to bookmarkmanager

backend/internal/session/session.go

@@ -14,13 +14,13 @@ import (
 )
 
 const (
-	CookieName = "mangabm_session"
+	CookieName = "bmgr_session"
 	// 60 days: long enough that a phone stays logged in between reading spells.
 	sessionTTL = 60 * 24 * time.Hour
 	// Domain separation, so the session key can never collide with any other
 	// use of the secrets it is derived from. Changing this string logs
 	// everyone out.
-	sessionKeyPurpose = "mangabm-web-session-v1"
+	sessionKeyPurpose = "bmgr-web-session-v1"
 )
 
 // Key derives the cookie-signing key from both secrets. Sessions are