Adds a 'Verify SSL Certificate' switch on Admin -> ABDM Gateway page,
persisted as hospital_setting.ABDM_BRIDGE_SSL_VERIFY (default ON/secure).
Wired into M3HiuGatewayClient, EAtriaBridgeConnector, and the settings
page's own Test Connection check. Per-machine ABDM_BRIDGE_SSL_VERIFY env
var still overrides this DB setting for deployments needing a quick
local-only workaround. Verification stays on by default everywhere;
disabling it is an explicit, visible opt-in with an on-page warning.
