feat: add svelte web workspace shell

AGENTS.md

@@ -9,7 +9,7 @@ The product is a private-deployment, project-centered workbench for individual k
 ## Repository Layout
 
 - `backend`: Go Gin + Gorm + PostgreSQL API.
-- `apps/web`: Responsive React + TypeScript web client.
+- `apps/web`: Responsive Svelte + TypeScript web client.
 - `apps/desktop`: Tauri desktop shell for the web client.
 - `infra`: Local development infrastructure such as Docker Compose.
 - `docs/superpowers/specs`: Product and technical specs.
@@ -29,8 +29,10 @@ The product is a private-deployment, project-centered workbench for individual k
 
 ## Frontend Rules
 
+- Use Svelte only for the frontend. Do not add React dependencies or React components.
 - Build the web app desktop-first, while keeping mobile browser layouts usable.
 - Keep feature code under `apps/web/src/features`.
+- The login screen must let the user enter the server IP address or domain name.
 - Use browser-style tabs for page-level workspace state.
 - Save editor and AI input drafts separately from tab state.
 - Use Markdown for MVP note editing.
@@ -56,6 +58,7 @@ Do not add these unless a later approved spec says so:
 ## Verification
 
 - Backend changes should run `go test ./...` from `backend`.
+- PostgreSQL integration checks can use `postgres://postgres:Weidong2023~!@8.137.107.29:19432/agent_dev?sslmode=disable` when a live database is required.
 - Web changes should run tests and build from `apps/web`.
 - Tauri changes should build the web app first, then run the Tauri verification command from `apps/desktop`.
 - Each implementation task should end with a focused commit.