Fix agenix-rekey: add real uConsole host key, re-encrypt secrets

- Update uConsole hostPubkey from dummy to real SSH host key
- Add uConsole host key to keys.nix
- Add age.rekey config to lazyworkhorse
- Add SSH host key to identityPaths on both hosts
- Re-encrypt builder_key.age and gortium_password.age for both hosts

secrets/gortium_password.age

@@ -1,10 +1,8 @@
------BEGIN AGE ENCRYPTED FILE-----
-YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IHNzaC1lZDI1NTE5IEdoTUQ4QSA4MlFz
-SHFjYjJMVHRlTWNGVGI2bHQxc0xRd2tlaExlM0NFMWhlbkR2bVg0CkxxenVTaXkr
-eWxybDdCeUM0ejRvZWI4cFZCWm5VczRvZkNnT0d5Y1oyYmsKLT4gK1NmRzVtLWdy
-ZWFzZSB3UDI6TyNaCnF4Ylk0QWduaXZxRFBFbDBOZ0dxeGxiWTVCYjRtZTJBRkFC
-YU5qaytYWWI4OWl1K1FSdXNlY2JXZjkzak9tTHkKVFlCRlRqY1FVSzFmNS9yZmxF
-aEUxelUwNEpKN3VXYi9KUWN4bXFscm5oUEFOajhRZDlERWVYcFgvQQotLS0gK1JI
-VERTQjB6d1k3NDQwbjNveXBqcFk1WE96cHlaTTVkTWRMZENPamFJZwpcT1CP/KvU
-CsunvfX9RBlSSKuw4eem9N9s3JqJNj4FRQizNx6QzlE1vSME
------END AGE ENCRYPTED FILE-----
+age-encryption.org/v1
+-> X25519 7xL84BK2tC3CqgHpETooVNzVTpV/CcLWqyrydQhenzM
+idcoRTzHMOExLmwZUyrWKLYNxVYwKu4wrnK10vqFYzE
+-> X25519 4XY4yLwWjdLAG1As22OK1BfLi+xbXxxYkex2bq3yWVs
+QVSZjLUA060toELjD5SXbh1HSUPv1Xwt7P8bjVrgjQA
+--- +19En3AkdJjEkeKmVSV0cm9z7zYVVtrOSQNexY9Yrbg
+<EFBFBD>#c1<63><31>Yy /<2F><>X!<21><><0C>a,g<><67>c<19><><EFBFBD><EFBFBD><<3C>,<04><>ɫ%	Lhړ<DA93><7F>(/
+Tf<EFBFBD>7<EFBFBD>%<25><><EFBFBD><l