Replace go-imap library with custom IMAP client, simplify CV layout styles, bump vite, move SEED_DB to backend

- Rewrite email_imap.go to use a minimal hand-rolled IMAP client instead of go-imap/go-message,
  for better compatibility with Outlook's non-standard responses
- Consolidate and simplify CVLayout.vue CSS overrides
- Bump vite from 7.1.11 to 7.3.2
- Move SEED_DB env var from nginx to backend in dev compose
- Add /app/src/wasm volume exclusion in dev compose

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/go.mod

@@ -5,8 +5,6 @@ go 1.25
 require (
 	github.com/99designs/gqlgen v0.17.88
 	github.com/anthropics/anthropic-sdk-go v1.26.0
-	github.com/emersion/go-imap v1.2.1
-	github.com/emersion/go-message v0.18.2
 	github.com/gin-gonic/gin v1.11.0
 	github.com/golang-jwt/jwt/v5 v5.3.0
 	github.com/gorilla/websocket v1.5.3