feat(auth): backward-compatible TTL check on SSO auth_ticket

Pairs with the CMS-side change introducing auth_ticket_expires_at (60s
expiry written on every ticket issuance). Without an emulator-side
verification the column was advisory only — this commit gates every
SELECT that resolves a user by auth_ticket on

    auth_ticket = ?
    AND (auth_ticket_expires_at IS NULL OR auth_ticket_expires_at >= NOW())

The NULL branch preserves backward-compatibility: CMS deployments that
do not yet populate the column keep working exactly like before
(every ticket passes the WHERE clause as soon as auth_ticket matches),
and the TTL takes effect automatically the moment a CMS starts writing
the expiry value.

Five SELECTs touched:
- SessionEndpoints.java (cms-issued SSO + remember-token flow)
- HabboManager.loadHabbo (game client login by ticket)
- SecureLoginEvent (legacy handshake path)

DB schema delivered both ways:
- Database Updates/Own_Database_RunFirst/020_auth_ticket_ttl.sql:
  idempotent ALTER, skips if column already present (information_schema
  guard so re-running the bundle is safe).
- Default Database/FullDatabase.sql: column added to the `users` table
  definition for fresh installs.

Bumps the emulator version to 4.2.7.

Emulator/pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>com.eu.habbo</groupId>
     <artifactId>Habbo</artifactId>
-    <version>4.2.6</version>
+    <version>4.2.7</version>
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>