Reduce media bandwidth: compress uploads, add long-lived cache headers, gzip API

- Resize/re-encode every uploaded image server-side (posts, avatars, stories,
  shop products/logo, chat messages) via a shared sharp-based optimizer —
  caps dimensions to what's actually displayed and re-compresses in place,
  cutting a typical raw camera photo by ~90% with no visible quality loss
- Cap uploaded video resolution/bitrate (re-encode only when above 1280px/
  ~2.5Mbps) alongside the existing faststart step; apply faststart+cap to
  story and chat videos too (previously stored completely raw)
- Add long-lived Cache-Control to all /storage static routes so clients stop
  re-downloading unchanged media on every request
- Add gzip/brotli compression for JSON API responses (feed/explore/chat)

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

controllers/application/chatRooms/chatRoomController.js

@@ -7,6 +7,13 @@ const ChatRoomModel = require('../../../models/ChatRoomModel')
 const ChatRoomMessageModel = require('../../../models/ChatRoomMessageModel')
 const UserModel = require('../../../models/UserModel')
 const { ProvinceModel, CityModel } = require('../../../models/StateCity')
+const { optimizeImageFile } = require('../../../utils/imageOptimize')
+let optimizeVideoFaststart = async () => {}
+try {
+  ({ optimizeVideoFaststart } = require('../../../utils/postVideoProcessing'))
+} catch (error) {
+  console.warn('[chatRoomController] postVideoProcessing unavailable:', error.message)
+}
 const {
   slugifyTitle,
   userCanSeeRoom,
@@ -227,6 +234,7 @@ const createRoom = async (req, res, next) => {
       const uniqueFileName = `${Date.now()}-${crypto.randomUUID()}${path.extname(imageFile.name || '')}`
       const filePath = path.join(uploadDir, uniqueFileName)
       await fs.move(imageFile.path, filePath)
+      await optimizeImageFile(filePath, { maxDimension: 800 })
       imagePath = `/chat-rooms/${uniqueFileName}`
     }
 
@@ -397,6 +405,13 @@ const sendRoomMessage = async (req, res, next) => {
       const uniqueFileName = `${Date.now()}-${crypto.randomUUID()}${path.extname(uploaded.name || '')}`
       const filePath = path.join(uploadDir, uniqueFileName)
       await fs.move(uploaded.path, filePath)
+      if (resolvedFileType === 'image' || (uploaded.type || '').startsWith('image/')) {
+        await optimizeImageFile(filePath)
+      } else if (resolvedFileType === 'video' || (uploaded.type || '').startsWith('video/')) {
+        optimizeVideoFaststart(filePath).catch((err) => {
+          console.error('[chatRoomController] video optimize background error:', err.message)
+        })
+      }
       fileUrl = `/chat-rooms/messages/${uniqueFileName}`
     }