refactor(migration): merge per-plugin SQL into single initial migration

Each plugin now has exactly one migration file (00001_initial.sql)
containing its complete table schema and seed data, replacing the
multi-file approach with split ALTER/INSERT steps.

Changes per plugin:
- auth: w_auth_sources, w_external_accounts, w_access_tokens + login session seed
- user: w_users + system user seed (removed w_access_tokens — belongs to auth)
- admin: w_system_configs, w_templates + all 32 config seeds + 2 template seeds
  (removed w_schedules, w_task_executions — belong to driver plugins)
- upload: w_upload_stats + indexes + access_mode + backfill
- message_gateway: all w_message_*, w_push_*, w_push_channels, w_push_histories
- risk_control/logstore: w_user_access_logs (PG + ClickHouse)
- driver_asynq_cron: w_schedules + cleanup seed
- driver_asynq_worker: w_task_executions

All CREATE TABLE use IF NOT EXISTS, all INSERT use ON CONFLICT DO NOTHING.
go:embed patterns remain 'migrations/*.sql' — unchanged.

plugins/domain/risk_control/logstore/migrations/00001_initial.sql

@@ -0,0 +1,20 @@
+-- +goose Up
+CREATE TABLE IF NOT EXISTS w_user_access_logs (
+    id          BIGINT NOT NULL,
+    user_id     BIGINT NOT NULL DEFAULT 0,
+    path        VARCHAR(2048) NOT NULL DEFAULT '',
+    method      VARCHAR(16) NOT NULL DEFAULT '',
+    ip          VARCHAR(128) NOT NULL DEFAULT '',
+    user_agent  TEXT NOT NULL DEFAULT '',
+    headers     TEXT NOT NULL DEFAULT '',
+    status      INTEGER NOT NULL DEFAULT 0,
+    latency     BIGINT NOT NULL DEFAULT 0,
+    created_at  TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (id, created_at)
+) PARTITION BY RANGE (created_at);
+
+CREATE INDEX IF NOT EXISTS idx_w_user_access_logs_user_id ON w_user_access_logs (user_id, created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_w_user_access_logs_created_at ON w_user_access_logs (created_at DESC);
+
+-- +goose Down
+DROP TABLE IF EXISTS w_user_access_logs;