Merge feature/split-signal-improvements into combined branch

Combines Signal split/merge improvements with keycloak auth,
baileys-7 updates, and signal notifications support.

Resolved conflicts:
- Kept LID user ID support in bridge-whatsapp
- Kept bridge-dev.yml docker compose addition
- Used 3.5.0-beta.1 version from split-signal-improvements

apps/bridge-whatsapp/package.json

@@ -1,17 +1,17 @@
 {
   "name": "@link-stack/bridge-whatsapp",
-  "version": "3.4.0-beta.7",
-  "type": "module",
+  "version": "3.5.0-beta.1",
   "main": "build/main/index.js",
   "author": "Darren Clarke <darren@redaranj.com>",
   "license": "AGPL-3.0-or-later",
   "dependencies": {
+    "@adiwajshing/keyed-db": "0.2.4",
     "@hapi/hapi": "^21.4.3",
     "@hapipal/schmervice": "^3.0.0",
     "@hapipal/toys": "^4.0.0",
     "@link-stack/bridge-common": "workspace:*",
     "@link-stack/logger": "workspace:*",
-    "@whiskeysockets/baileys": "7.0.0-rc.9",
+    "@whiskeysockets/baileys": "6.7.21",
     "hapi-pino": "^13.0.0",
     "link-preview-js": "^3.1.0"
   },
@@ -19,12 +19,15 @@
     "@link-stack/eslint-config": "workspace:*",
     "@link-stack/jest-config": "workspace:*",
     "@link-stack/typescript-config": "workspace:*",
+    "@types/long": "^5",
     "@types/node": "*",
+    "dotenv-cli": "^10.0.0",
+    "tsx": "^4.20.6",
     "typescript": "^5.9.3"
   },
   "scripts": {
     "build": "tsc -p tsconfig.json",
-    "dev": "node --env-file=.env --experimental-transform-types src/index.ts",
+    "dev": "dotenv -- tsx src/index.ts",
     "start": "node build/main/index.js"
   }
 }