refactor(push): clean up legacy push_config and w_push_events hardcoded insertions

- Remove ConfigKeyPushConfig and delete legacy push_config query logic from EventTrigger.Trigger.
- Simplify the push event notification dispatching engine to rely purely on database custom channels.
- Remove w_push_events hardcoded INSERT statement from migration files, letting SyncEvents handle default event registration.
- Rewrite unit tests to use model.PushChannel instead of push_config.

internal/db/migrator/goose/postgres/202606140002_add_push_configs.sql

@@ -1,27 +0,0 @@
--- +goose Up
-INSERT INTO w_system_configs (key, value, type, visibility, description, created_at, updated_at)
-VALUES (
-    'push_config',
-    '[]',
-    'system',
-    0,
-    '通知推送渠道配置',
-    CURRENT_TIMESTAMP,
-    CURRENT_TIMESTAMP
-) ON CONFLICT (key) DO NOTHING;
-
-INSERT INTO w_push_events (event_key, name, channels, targets, template, enabled, created_at, updated_at)
-VALUES (
-    'admin_login',
-    '管理员登录',
-    '[]',
-    '[]',
-    '{"title": "管理员登录提醒", "content": "管理员 {{user.username}} 于 {{time}} 从 IP: {{ip}} 登录成功。", "level": "INFO"}',
-    false,
-    CURRENT_TIMESTAMP,
-    CURRENT_TIMESTAMP
-) ON CONFLICT (event_key) DO NOTHING;
-
--- +goose Down
-DELETE FROM w_system_configs WHERE key = 'push_config';
-DELETE FROM w_push_events WHERE event_key = 'admin_login';

internal/db/migrator/goose/postgres/202606160001_remove_push_config.sql

@@ -0,0 +1,5 @@
+-- +goose Up
+DELETE FROM w_system_configs WHERE key = 'push_config';
+DELETE FROM w_push_events WHERE event_key = 'admin_login';
+
+-- +goose Down

internal/db/migrator/goose/sqlite/202606140002_add_push_configs.sql

@@ -1,27 +0,0 @@
--- +goose Up
-INSERT OR IGNORE INTO w_system_configs (key, value, type, visibility, description, created_at, updated_at)
-VALUES (
-    'push_config',
-    '[]',
-    'system',
-    0,
-    '通知推送渠道配置',
-    CURRENT_TIMESTAMP,
-    CURRENT_TIMESTAMP
-);
-
-INSERT OR IGNORE INTO w_push_events (event_key, name, channels, targets, template, enabled, created_at, updated_at)
-VALUES (
-    'admin_login',
-    '管理员登录',
-    '[]',
-    '[]',
-    '{"title": "管理员登录提醒", "content": "管理员 {{user.username}} 于 {{time}} 从 IP: {{ip}} 登录成功。", "level": "INFO"}',
-    false,
-    CURRENT_TIMESTAMP,
-    CURRENT_TIMESTAMP
-);
-
--- +goose Down
-DELETE FROM w_system_configs WHERE key = 'push_config';
-DELETE FROM w_push_events WHERE event_key = 'admin_login';

internal/db/migrator/goose/sqlite/202606160001_remove_push_config.sql

@@ -0,0 +1,5 @@
+-- +goose Up
+DELETE FROM w_system_configs WHERE key = 'push_config';
+DELETE FROM w_push_events WHERE event_key = 'admin_login';
+
+-- +goose Down

internal/db/migrator/migrator_test.go

@@ -17,7 +17,7 @@ import (
 	"gorm.io/gorm"
 )
 
-const expectedMigratedSystemConfigCount = 32
+const expectedMigratedSystemConfigCount = 31
 
 func TestMigrateInitializesSQLiteDatabase(t *testing.T) {
 	sqliteDB, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{