fix(deploy): .env.docker sans quotes — source + sed corrigé

Root cause: workflow deploy.yaml ligne 74 écrivait VAR="value"
Docker Compose v2 (2.22+) rejette ce format.

Fix source: echo "${key}=${val}" (sans quotes autour de la valeur)
Fix sed: deux passes séparées pour double et simple quotes, sans \x27

.gitea/workflows/deploy.yaml

@@ -71,7 +71,7 @@ jobs:
             local key="$1" val="$2"
             [ -z "$val" ] && return
             sed -i "/^[[:space:]]*${key}=/d" "$ENV_FILE"
-            echo "${key}=\"${val}\"" >> "$ENV_FILE"
+            echo "${key}=${val}" >> "$ENV_FILE"
           }
           upsert NEXTAUTH_URL           "$APP_URL"
           upsert NEXTAUTH_SECRET        "$NEXTAUTH_SECRET"