refactor: nginx.conf is source of truth, drop generate script and template

nginx/nginx.conf is symlinked directly into system nginx config.
No need for a per-domain generate script or template — edit the file,
run nginx -t && systemctl reload nginx.

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

scripts/generate-nginx-conf.sh

@@ -1,52 +0,0 @@
-#!/bin/bash
-# Generate an nginx site config for one domain from the template.
-#
-# Usage:
-#   sudo ./scripts/generate-nginx-conf.sh my-products.ru
-#   sudo ./scripts/generate-nginx-conf.sh xn----8sbfwtmcso8g.xn--p1ai
-#
-# For IDN/Cyrillic domains, pass the punycode form.
-# Writes to /etc/nginx/sites-available/<domain>.conf and symlinks to sites-enabled.
-# If no argument is given, DOMAIN is read from .env.
-
-set -euo pipefail
-
-SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
-REPO_DIR="$(dirname "$SCRIPT_DIR")"
-TEMPLATE="$REPO_DIR/nginx/nginx.conf.template"
-
-# ── resolve domain ────────────────────────────────────────────────────────────
-if [ -n "${1:-}" ]; then
-  DOMAIN="$1"
-else
-  if [ -f "$REPO_DIR/.env" ]; then
-    DOMAIN_FROM_ENV=$(grep -E '^DOMAIN=' "$REPO_DIR/.env" | cut -d= -f2- | tr -d '"'"'" | head -1)
-    DOMAIN="${DOMAIN:-${DOMAIN_FROM_ENV:-}}"
-  fi
-fi
-
-if [ -z "${DOMAIN:-}" ]; then
-  echo "ERROR: no domain specified." >&2
-  echo "Usage: $0 <domain>  or set DOMAIN= in .env" >&2
-  exit 1
-fi
-
-CONF_FILE="/etc/nginx/sites-available/${DOMAIN}.conf"
-ENABLED_LINK="/etc/nginx/sites-enabled/${DOMAIN}.conf"
-
-echo "==> Generating nginx config for: $DOMAIN"
-DOMAIN="$DOMAIN" envsubst '$DOMAIN' < "$TEMPLATE" | sudo tee "$CONF_FILE" > /dev/null
-
-if [ ! -L "$ENABLED_LINK" ]; then
-  sudo ln -s "$CONF_FILE" "$ENABLED_LINK"
-  echo "==> Symlinked to sites-enabled"
-else
-  echo "==> Symlink already exists in sites-enabled"
-fi
-
-echo "==> Testing nginx config..."
-sudo nginx -t
-
-echo ""
-echo "==> Config written to: $CONF_FILE"
-echo "    Reload nginx to apply: sudo systemctl reload nginx"