refactor(gui): разделить app.go на binding-файлы по доменам, вынести sync apply

- app.go (1810→280 строк): только App struct, startup, DTOs, helpers
- bindings_{nodes,files,notes,actions,worklog,activity,sync,settings}.go
- sync_apply.go: все applyRemote* методы
- i18n: internal/i18n (Go, embed JSON) + frontend/src/lib/i18n (JS)
- core/sync/safe_path.go: SafeVaultPath
- scripts/check-i18n.sh: проверка хардкода кириллицы и bidi-символов
- build.sh: NVM loading, set -e

Все сборки (CLI, server, gui, frontend), go vet, go test проходят.

scripts/check-i18n.sh

@@ -0,0 +1,82 @@
+#!/bin/bash
+# Check for hardcoded Russian/Cyrillic user-facing strings in source code.
+# Excludes locale files, docs, tests with explicit locale checks.
+
+set -e
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+EXIT=0
+
+# Find Cyrillic characters in source files, excluding allowed paths.
+# The regex matches any Cyrillic character range.
+# Allowed exceptions:
+#   - locale files (*/i18n/locales/*)
+#   - docs/*
+#   - README*
+#   - spaces/
+#   - .json files that are templates or configs
+#   - .md files
+
+echo "=== Checking for hardcoded Cyrillic in source code ==="
+
+# Search for Cyrillic characters in Go files (excluding locale files)
+GO_CYRILLIC=$(find "$ROOT" -name '*.go' \
+  ! -path "*/i18n/locales/*" \
+  -exec grep -l '[А-Яа-я]' {} \; 2>/dev/null || true)
+
+if [ -n "$GO_CYRILLIC" ]; then
+  echo "WARNING: Cyrillic found in Go files (expected in server HTML templates for now):"
+  echo "$GO_CYRILLIC"
+  # Don't fail for Go files with HTML templates — they'll be refactored later
+fi
+
+# Search for Cyrillic in Svelte/JS files (excluding locale files)
+JS_CYRILLIC=$(find "$ROOT/frontend/src" -name '*.svelte' -o -name '*.js' | \
+  grep -v 'i18n/locales' | \
+  xargs grep -l '[А-Яа-я]' 2>/dev/null || true)
+
+if [ -n "$JS_CYRILLIC" ]; then
+  echo ""
+  echo "FAIL: Cyrillic found in frontend source files (outside locale files):"
+  echo "$JS_CYRILLIC"
+  echo ""
+  echo "These should use t() from lib/i18n instead."
+  EXIT=1
+fi
+
+# Check for common bidi/control unicode characters
+echo ""
+echo "=== Checking for bidi/control Unicode characters ==="
+BIDI=$(find "$ROOT" -name '*.go' -o -name '*.svelte' -o -name '*.js' | \
+  xargs grep -Pl '[\x{202A}-\x{202E}\x{2066}-\x{2069}\x{200E}\x{200F}\x{061C}]' 2>/dev/null || true)
+
+if [ -n "$BIDI" ]; then
+  echo "FAIL: Bidi/control Unicode characters found in:"
+  echo "$BIDI"
+  EXIT=1
+else
+  echo "OK: No bidi/control characters found"
+fi
+
+# Check that locale keys in ru.js and en.js match
+echo ""
+echo "=== Checking locale key consistency ==="
+RU_KEYS=$(grep -oP "^\s+'[^']+'" "$ROOT/frontend/src/lib/i18n/locales/ru.js" | sed "s/^ *'//;s/'$//" | sort)
+EN_KEYS=$(grep -oP "^\s+'[^']+'" "$ROOT/frontend/src/lib/i18n/locales/en.js" | sed "s/^ *'//;s/'$//" | sort)
+
+MISSING_EN=$(comm -23 <(echo "$RU_KEYS") <(echo "$EN_KEYS"))
+MISSING_RU=$(comm -23 <(echo "$EN_KEYS") <(echo "$RU_KEYS"))
+
+if [ -n "$MISSING_EN" ]; then
+  echo "WARNING: Keys in ru.js but missing in en.js:"
+  echo "$MISSING_EN"
+fi
+if [ -n "$MISSING_RU" ]; then
+  echo "WARNING: Keys in en.js but missing in ru.js:"
+  echo "$MISSING_RU"
+fi
+if [ -z "$MISSING_EN" ] && [ -z "$MISSING_RU" ]; then
+  echo "OK: All locale keys match between ru.js and en.js"
+fi
+
+exit $EXIT