Add richer error reporting and simplify control flow across core components. Key changes:
- Add errorMessage to ConfigResult and populate it on failures in CoreConfigManager.getV2rayConfig/getV2rayConfig4Speedtest.
- Replace many nullable/boolean error returns in CoreConfigManager with explicit errors (error()/exceptions) and non-null return types; tighten validation (invalid servers, missing assets, parsing errors) and simplify inbound/dns/routing/outbound setup logic.
- Make getInbounds/getRouting/getDns/getOutbounds/getCustomLocalDns/getRoutingUserRule/getBalance non-failing (throw on error) and remove silent try/catch patterns; improve logging and fallback behaviors.
- CoreServiceManager: wrap startContextService calls with try/catch to surface errors to UI; startContextService now throws on invalid state/config and moves startup loop into doStartCoreLoop which registers receivers, starts core loop, and reports detailed failures to UI.
- Show notification when VPN service starts (CoreVpnService) to ensure foreground visibility.
- MainViewModel: display detailed start failure message from intent when available instead of only a generic toast.
These changes improve diagnostics, reduce silent failures, and centralize error handling during startup.
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