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/README.md

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+# FusionPBX Custom Configs (134.209.72.226)
+
+## Yealink T48S Provisioning Templates
+Applied to: /var/www/fusionpbx/resources/templates/provision/yealink/t48s/
+
+### y000000000000.boot
+- `overwrite_mode = 1` — phones re-provision on every reboot (critical)
+
+### y000000000065.cfg key changes
+- `features.auto_linekeys.enable = 0` — prevents phone firmware from auto-overriding BLF keys
+
+## BLF Configuration
+- Yealink T48S BLF type = **16** (in FusionPBX device profile)
+- pickup_value field required for type=16 BLF keys
+- manage-presence = true already set in FreeSWITCH external sofia profile
+
+## Provisioning URL
+https://fusion.orbishosting.com/app/provision/
+Auth: provision-master / Joker1974!!!
+
+## fail2ban Whitelist
+- 107.178.2.130 (office)
+- 97.154.109.245 (home WAN)