fix: all lint errors, test + lint pre-commit passing

Frontend:
- Split nodeTypes/edgeTypes into separate .ts files (react-refresh)
- Remove setState-in-effect in NodeModal (key prop reset)
- Fix handleSave accessed before declaration (useRef pattern)
- Exclude src/components/ui/** from eslint (shadcn generated)
- Use defineConfig from vitest/config for test type support

Backend:
- ruff --fix: sort imports, datetime.UTC alias
- Raise line-length to 120, ignore E501 in tests
- Break long update_node/update_edge signatures
- pyproject.toml: per-file-ignores for tests

frontend/src/components/canvas/nodes/index.tsx

@@ -20,16 +20,3 @@ export const IotNode = (props: N) => <BaseNode {...props} icon={Cpu} glowColor="
 export const ApNode = (props: N) => <BaseNode {...props} icon={Wifi} glowColor="#00d4ff" />
 export const GenericNode = (props: N) => <BaseNode {...props} icon={Circle} glowColor="#8b949e" />
 
-export const nodeTypes = {
-  isp: IspNode,
-  router: RouterNode,
-  switch: SwitchNode,
-  server: ServerNode,
-  proxmox: ProxmoxNode,
-  vm: VmNode,
-  lxc: LxcNode,
-  nas: NasNode,
-  iot: IotNode,
-  ap: ApNode,
-  generic: GenericNode,
-}

frontend/src/components/canvas/nodes/nodeTypes.ts

@@ -0,0 +1,15 @@
+import { IspNode, RouterNode, SwitchNode, ServerNode, ProxmoxNode, VmNode, LxcNode, NasNode, IotNode, ApNode, GenericNode } from './index'
+
+export const nodeTypes = {
+  isp: IspNode,
+  router: RouterNode,
+  switch: SwitchNode,
+  server: ServerNode,
+  proxmox: ProxmoxNode,
+  vm: VmNode,
+  lxc: LxcNode,
+  nas: NasNode,
+  iot: IotNode,
+  ap: ApNode,
+  generic: GenericNode,
+}