Add FusionPBX configs: Yealink T48S provisioning + fail2ban whitelist

- y000000000000.boot: overwrite_mode=1 forces re-provision on every reboot
- BLF type=16 for Yealink T48S in FusionPBX (with pickup_value required)
- auto_linekeys.enable=0 prevents phone from overriding DSS key config
- fail2ban whitelist: 107.178.2.130 (office) + 97.154.109.245 (home WAN)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

fusionpbx/provision/yealink/t48s/y000000000000.boot

@@ -0,0 +1,7 @@
+#!version:1.0.0.1
+## The header above must appear as-is in the first line
+
+include:config "y000000000065.cfg"
+include:config "{$mac}.cfg"
+
+overwrite_mode = 1