fix(docker): prevent backend crash loop caused by pdf-parse native deps

pdf-parse@2.4.5 pulls in @napi-rs/canvas (native Skia binary) which
crashes on import in Alpine containers. Moved to lazy require() so the
app starts normally and pdf-parse loads only when PDF conversion is
actually requested.
- Lazy-load pdf-parse in pdfToStatement to avoid startup crash
- Add libc6-compat, fontconfig, freetype to Alpine runner stage
- Increase npm fetch timeouts in both Dockerfiles for slow networks
- Add connectionTimeoutMillis to pg Pool for faster failure detection

Dockerfile.frontend

@@ -9,6 +9,11 @@ COPY package.json package-lock.json* tsconfig.json* ./
 COPY shared ./shared
 COPY frontend ./frontend
 
+# Увеличиваем таймауты и повторы для нестабильной сети
+RUN npm config set fetch-retry-mintimeout 20000 && \
+    npm config set fetch-retry-maxtimeout 120000 && \
+    npm config set fetch-timeout 300000
+
 # Устанавливаем зависимости из корня
 RUN npm install