add ai guidline

AI.md

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+# AI Guidelines — Domotique Rust/Leptos
+
+## Project overview
+
+Home automation dashboard built with Leptos (full-stack Rust). Exposes a web UI for managing quick links and controlling shutters via HTTP API to IoT devices. Runs as a systemd service with SSR + WASM hydration.
+
+## Tech stack
+
+| Layer | Technology |
+|---|---|
+| Framework | Leptos 0.6 (SSR + hydration) |
+| Server | Axum 0.7 + Tokio |
+| Database | MySQL via SQLx 0.8 (compile-time checked queries) |
+| Frontend | WASM (wasm-bindgen), Tailwind CSS 4 |
+| Build | cargo-leptos, Makefile |
+
+## Architecture
+
+### Dual-target compilation
+
+- `ssr` feature: binary target, runs Axum, has DB access, pre-renders HTML
+- `hydrate` feature: lib target compiled to WASM, mounts into DOM
+
+Gate all server-only code (database, filesystem, secrets) with `#[cfg(feature = "ssr")]`.
+
+### Directory layout
+
+```
+src/
+  app.rs          # App component, router, nav
+  lib.rs          # WASM entry point (hydrate feature)
+  main.rs         # Binary entry point (ssr feature)
+  setup.rs        # Axum server initialization
+  database.rs     # Global MySqlPool (OnceLock)
+  models/         # Data models + SQL queries
+  routes/         # Page components + server functions
+migrations/       # SQLx migrations (timestamp-named)
+style/            # Compiled Tailwind output
+input.css         # Tailwind source
+```
+
+### Data flow
+
+1. Page component defines a `Resource` that calls a server function
+2. Server function (`#[server]`) queries the DB via `sqlx::query!`
+3. Mutations use `create_server_action` or `create_action`
+4. After mutation, increment a version signal to trigger resource refetch
+
+## Coding conventions
+
+### Language & naming
+
+- UI labels and user-facing strings are in **French** (e.g., `Liens`, `Volets`)
+- Rust identifiers follow standard conventions: `snake_case` for functions/variables, `PascalCase` for types and components
+- Server function names are descriptive PascalCase (e.g., `GetLinksAction`, `LinkAction`)
+
+### Components
+
+- One `#[component]` per logical unit, small and single-responsibility
+- Use `create_rw_signal` / `create_signal` for local state
+- Use `Resource` for async data; include a version signal for cache invalidation
+- Modal pattern for forms: single component toggled between create/edit mode
+
+### Server functions
+
+```rust
+#[server(MyAction, "/api", "GetJson")]  // or "Cbor" for mutations
+pub async fn my_action(...) -> Result<T, ServerFnError> {
+    // DB access gated by ssr feature implicitly via #[server]
+}
+```
+
+- Return `Result<T, ServerFnError>`
+- Log errors with `tracing::error!` before returning a generic error to the client
+- Never expose internal error details to the client
+
+### Database
+
+- Use `sqlx::query!` / `sqlx::query_as!` for compile-time checked SQL
+- Access the pool via the global `get_db()` helper in `database.rs`
+- Keep queries in the model file for the relevant type (`models/link.rs`)
+- Connection pool max: 4 connections — avoid holding connections across await points
+
+### Styling
+
+- Tailwind utility classes only — no custom CSS except CSS variables in `input.css`
+- Dark-first design; use `dark:` variants when needed
+- Custom color tokens (defined in `input.css`, OKLCH color space):
+  - `prim`, `prim-light` — primary accent
+  - `second`, `second-dark` — secondary
+  - `third`, `third-light` — tertiary accent
+  - `fourth`, `green` — utility
+- Responsive breakpoints: `xs:`, `sm:`, `md:`, `lg:`
+
+### Error handling
+
+- Server functions: `Result<T, ServerFnError>`, log then return generic message
+- Components: handle `None` / error states explicitly in the view
+- Avoid `unwrap()` in production paths; use `?` or explicit error handling
+
+## Development workflow
+
+```bash
+# Start dev server (auto-reload)
+cargo leptos watch
+
+# Watch Tailwind in parallel
+npx tailwindcss -i input.css -o ./style/output.css --watch
+
+# Run DB migrations
+sqlx migrate run
+
+# Production deploy
+make install   # builds Tailwind + WASM + binary, restarts systemd service
+```
+
+Environment variables are loaded from `.env` (`DATABASE_URL` required).
+
+## Key patterns to follow
+
+- **No new dependencies** without a clear reason — the stack is intentionally minimal
+- **No JavaScript** — all interactivity through Leptos/WASM
+- **Keep components in `routes/`** unless genuinely reusable across multiple pages
+- **New DB tables** require a migration file in `migrations/`
+- **External API calls** (e.g., shutters) go through server functions, never from WASM directly
+- **Do not add features** beyond what is asked; this is a personal tool, not a framework