fix: histsync LID improvements — raw_id mapping, prekeys, keepalive j… (#304)

* fix: histsync LID improvements — raw_id mapping, prekeys, keepalive jitter, CDN DELETE

* fix: prekey pool strategy — 800 initial, top-up to 800 when below 200

- INITIAL_PREKEY_COUNT: 812 → 800 (rounded, matches WA Business ~812 from CDP capture)
- MIN_PREKEY_COUNT: 25 → 200 (replenishment trigger threshold)
- uploadPreKeysToServerIfRequired: top-up to INITIAL_PREKEY_COUNT instead of
  uploading a flat MIN_PREKEY_COUNT — restores full 800-key pool on each replenish
- handleEncryptNotification: same top-up logic (INITIAL_PREKEY_COUNT - count)
  so server notification path also restores to 800, not just adds 200

uploadPreKeys(5) in error recovery path intentionally left unchanged.

src/Socket/messages-send.ts

@@ -9,6 +9,7 @@ import type {
 	AlbumMessageOptions,
 	AlbumSendResult,
 	AnyMessageContent,
+	LIDMapping,
 	MediaConnInfo,
 	MessageReceiptType,
 	MessageRelayOptions,
@@ -338,6 +339,33 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 				}
 			}
 
+			// 4th LID→PN source: device-list entries sharing the same raw_id
+			// WA Business uses this for accounts where HistorySync sends zero phoneNumberToLidMappings
+			const allEntries = [...result.list, ...result.sideList]
+			const rawIdMap = new Map<number, { pn?: string; lid?: string }>()
+			for (const item of allEntries) {
+				if (typeof item.rawId !== 'number' || isNaN(item.rawId)) continue
+				const decoded = jidDecode(item.id)
+				if (!decoded) continue
+				const entry = rawIdMap.get(item.rawId) || {}
+				if (decoded.server === 'lid' || decoded.server === 'hosted.lid') {
+					entry.lid = item.id
+				} else if (decoded.server === 's.whatsapp.net' || decoded.server === 'c.us') {
+					entry.pn = item.id
+				}
+				rawIdMap.set(item.rawId, entry)
+			}
+			const rawIdMappings: LIDMapping[] = []
+			for (const { pn, lid } of rawIdMap.values()) {
+				if (pn && lid) {
+					rawIdMappings.push({ lid: jidNormalizedUser(lid), pn: jidNormalizedUser(pn) })
+				}
+			}
+			if (rawIdMappings.length > 0) {
+				await signalRepository.lidMapping.storeLIDPNMappings(rawIdMappings)
+				logger.debug({ count: rawIdMappings.length }, 'stored LID-PN mappings from raw_id pairing')
+			}
+
 			const meId = authState.creds.me?.id
 			if (!meId) throw new Boom('Not authenticated', { statusCode: 401 })
 			const meLid = authState.creds.me?.lid || ''