feat(db): split migrations into dialect-specific sqlite and postgres packages

backend/plugins/domain/upload/migrations/sqlite/00001_initial.sql

@@ -0,0 +1,40 @@
+-- +goose Up
+-- +goose StatementBegin
+CREATE TABLE IF NOT EXISTS w_uploads (
+    id BIGINT PRIMARY KEY,
+    user_id BIGINT NOT NULL,
+    file_name VARCHAR(255) NOT NULL,
+    file_path VARCHAR(500) NOT NULL,
+    file_size BIGINT NOT NULL,
+    mime_type VARCHAR(100) NOT NULL,
+    extension VARCHAR(50) NOT NULL,
+    hash VARCHAR(64),
+    type VARCHAR(50) NOT NULL,
+    status VARCHAR(20) NOT NULL,
+    access_mode INTEGER NOT NULL DEFAULT 0,
+    metadata TEXT NOT NULL DEFAULT '{}',
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
+);
+CREATE INDEX IF NOT EXISTS idx_w_uploads_user_id ON w_uploads (user_id);
+CREATE INDEX IF NOT EXISTS idx_w_uploads_file_path ON w_uploads (file_path);
+CREATE INDEX IF NOT EXISTS idx_w_uploads_hash ON w_uploads (hash);
+CREATE INDEX IF NOT EXISTS idx_w_uploads_type ON w_uploads (type);
+CREATE INDEX IF NOT EXISTS idx_w_uploads_status_created_at ON w_uploads (status, created_at);
+CREATE INDEX IF NOT EXISTS idx_w_uploads_hash_file_size_status ON w_uploads (hash, file_size, status);
+
+CREATE TABLE IF NOT EXISTS w_upload_stats (
+    dimension VARCHAR(32) NOT NULL,
+    stat_key VARCHAR(64) NOT NULL DEFAULT '',
+    file_count BIGINT NOT NULL DEFAULT 0,
+    file_size BIGINT NOT NULL DEFAULT 0,
+    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (dimension, stat_key)
+);
+-- +goose StatementEnd
+
+-- +goose Down
+-- +goose StatementBegin
+DROP TABLE IF EXISTS w_upload_stats;
+DROP TABLE IF EXISTS w_uploads;
+-- +goose StatementEnd