nodejs: lazy per-backend libsimplex download (#7543)

* ci: drop dlltool from nodejs libs release

* nodejs: download libsimplex into the user cache

* nodejs: load libsimplex at runtime per backend

* support bot: select db backend with --db

* python: match backend switch error text

* nodejs: download prebuilt add-on at runtime

* ci: build nodejs add-on for libs release

* calculator bot: load libs and add-on in image

* support bot: document add-on override

* nodejs: keep worker test output free of colors

* nodejs: verify sha-256 of downloaded assets

* python: pin core libs release with sha-256

* ci: add packages release script

* ci: release nodejs add-on and open release PR

* ci: publish packages after release PR

* nodejs: keep npm from building the add-on

* calculator bot: build the add-on in the image

* ci: merge package release workflows

* ci: open release PR when publishing fails

* ci: build the add-on with node-addon-api only

* ci: skip publishing in a called packages workflow

* ci: update package release actions to Node 24

* nodejs: fix receive test timeout

* ci: test packages on pull requests

* nodejs: reuse the database in the close stress test

* ci: keep failed package tests from hanging

* ci: skip preset server tests

* ci: plan package builds from the changes

* ci: test packages with a given libsimplex

* ci: test packages with libsimplex of core changes

packages/simplex-chat-nodejs/docs/core.Function.chatMigrateInit.md

@@ -8,7 +8,7 @@
 
 > **chatMigrateInit**(`dbPath`, `dbKey`, `confirm`, `queueSize?`): `Promise`\<`bigint`\>
 
-Defined in: [src/core.ts:8](../src/core.ts#L8)
+Defined in: [src/core.ts:30](../src/core.ts#L30)
 
 Initialize chat controller