feat: chat folders, attachments, treeview backend - migration, models, routes

app/plugins/builtins/ai_assistant/migrations/0002_folders_attachments.sql

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+-- AI Assistant plugin migration 0002: chat folders + attachments
+
+CREATE TABLE IF NOT EXISTS ai_chat_folders (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    name VARCHAR(255) NOT NULL,
+    parent_id UUID REFERENCES ai_chat_folders(id) ON DELETE CASCADE,
+    user_id UUID NOT NULL,
+    tenant_id UUID NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    deleted_at TIMESTAMPTZ
+);
+CREATE INDEX IF NOT EXISTS ix_ai_folders_user ON ai_chat_folders(user_id);
+CREATE INDEX IF NOT EXISTS ix_ai_folders_tenant ON ai_chat_folders(tenant_id);
+CREATE INDEX IF NOT EXISTS ix_ai_folders_parent ON ai_chat_folders(parent_id);
+
+ALTER TABLE ai_chat_sessions ADD COLUMN IF NOT EXISTS folder_id UUID REFERENCES ai_chat_folders(id) ON DELETE SET NULL;
+
+CREATE TABLE IF NOT EXISTS ai_chat_attachments (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    message_id UUID REFERENCES ai_chat_messages(id) ON DELETE CASCADE,
+    session_id UUID NOT NULL REFERENCES ai_chat_sessions(id) ON DELETE CASCADE,
+    filename VARCHAR(255) NOT NULL,
+    mime_type VARCHAR(255) NOT NULL DEFAULT 'application/octet-stream',
+    size_bytes INTEGER NOT NULL DEFAULT 0,
+    storage_path VARCHAR(1024) NOT NULL,
+    tenant_id UUID NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    deleted_at TIMESTAMPTZ
+);
+CREATE INDEX IF NOT EXISTS ix_ai_attachments_message ON ai_chat_attachments(message_id);
+CREATE INDEX IF NOT EXISTS ix_ai_attachments_session ON ai_chat_attachments(session_id);
+CREATE INDEX IF NOT EXISTS ix_ai_attachments_tenant ON ai_chat_attachments(tenant_id);