Start Twitch alerts and tickets off on new servers

Every module that can be switched on or off now starts off. A server
with no settings yet reads as off; setting the Twitch alert channel or
running /tickets setup for the first time turns that module on, and
existing settings are left as they are. schema.sql mirrors the API's
migration 000019.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

schema.sql

@@ -46,7 +46,7 @@ CREATE TABLE IF NOT EXISTS levelup (
 CREATE TABLE IF NOT EXISTS twitch_config (
     guild_id BIGINT PRIMARY KEY,
     twitch_channel_id BIGINT,
-    enabled BOOLEAN NOT NULL DEFAULT TRUE
+    enabled BOOLEAN NOT NULL DEFAULT FALSE
 );
 
 CREATE TABLE IF NOT EXISTS rps (
@@ -180,7 +180,7 @@ CREATE TABLE IF NOT EXISTS music_commands (
 -- Tickets (mirror of velox-dashboard-api migration 000016_tickets)
 CREATE TABLE IF NOT EXISTS ticket_settings (
     guild_id BIGINT PRIMARY KEY,
-    enabled BOOLEAN NOT NULL DEFAULT TRUE,
+    enabled BOOLEAN NOT NULL DEFAULT FALSE,
     channel_id BIGINT,
     log_channel_id BIGINT,
     panel_message_id BIGINT,