feat: add CI pipeline with ESLint, refactor deploy with rollback + Telegram

- Add eslint.config.mjs (flat config, eslint-config-next@16 + TypeScript)
- Add .gitea/workflows/ci.yaml (lint, test:unit, build on all branches)
- Refactor deploy.yaml: needs: [ci] gate, Docker rollback tag, Telegram notifications
- Fix 3 pre-existing lint errors (empty interfaces, ts-ignore, require imports)

memento-note/components/ui/label.tsx

@@ -1,7 +1,7 @@
 import * as React from "react"
 import { cn } from "@/lib/utils"
 
-export interface LabelProps extends React.LabelHTMLAttributes<HTMLLabelElement> {}
+export type LabelProps = React.LabelHTMLAttributes<HTMLLabelElement>
 
 export function Label({ className, ...props }: LabelProps) {
   return (