feat: add eLabFTW Cloudron package (Business-Apps) [#669]

Official-image wrapper of elabftw/elabimg 5.6.12 (tag+digest pinned);
localstorage + mysql + ldap addons; httpPort 443 via DISABLE_HTTPS.
No OIDC upstream -> native LDAP flagged auth-risk. First mysql-addon
and first Business-Apps package; 15/~57. Build verified green under
ukrrs-batch.slice. Docs synced (JOURNAL s15, README, STATUS).

Detail + verification: https://projects.knownelement.com/issues/669#note-3938

Package-Workspace/Business-Apps/elabftw/CloudronManifest.json

@@ -0,0 +1,23 @@
+{
+  "manifestVersion": 2,
+  "type": "app",
+  "id": "io.cloudron.elabftw",
+  "title": "eLabFTW",
+  "description": "Open-source electronic lab notebook (ELN) and lab inventory manager for research teams: experiments, resources database, scheduling, digital signatures and timestamps, PDF/export pipelines. MySQL stores all state; uploads and exports persist in Cloudron localstorage. Auth note: eLabFTW has no OIDC support; single sign-on is provided via the Cloudron LDAP directory configured in the admin panel (auth-risk: LDAP).",
+  "author": "Nicolas CARPi / Deltablot",
+  "website": "https://www.elabftw.net/",
+  "contactEmail": "cloudron@tsys.dev",
+  "tagline": "Electronic lab notebook and inventory for research teams",
+  "version": "5.6.12",
+  "healthCheckPath": "/",
+  "httpPort": 443,
+  "memoryLimit": 1536,
+  "addons": {
+    "localstorage": true,
+    "mysql": {},
+    "ldap": {}
+  },
+  "mediaLinks": [],
+  "changelog": "Initial Cloudron package for eLabFTW 5.6.12 (official-image wrapper of elabftw, digest pinned). start.sh waits for the MySQL addon, maps CLOUDRON_MYSQL_* into elabimg DB_* variables, persists the SECRET_KEY under /app/data and binds uploads/exports into the localstorage volume; the schema is installed and updated automatically (AUTO_DB_INIT/AUTO_DB_UPDATE). Plain HTTP on the internal port via DISABLE_HTTPS (TLS terminates at the Cloudron proxy). No OIDC upstream: the ldap addon is enabled and the admin wires CLOUDRON_LDAP_* into Admin panel - LDAP (auth-risk flag); SAML also available for an external IdP.",
+  "icon": "file://logo.png"
+}