Function loadBridgeConfig

Returns {
    bridge: {
        providers: {
            anthropic: {
                enabled: boolean;
                gatewayRoute: string;
                modelAllowlist: string[];
            };
            gemini: {
                enabled: boolean;
                gatewayRoute: string;
                modelAllowlist: string[];
            };
            local: {
                enabled: boolean;
                gatewayRoute: string;
                modelAllowlist: string[];
            };
            openai: {
                enabled: boolean;
                gatewayRoute: string;
                modelAllowlist: string[];
            };
            openrouter: {
                enabled: boolean;
                gatewayRoute: string;
                modelAllowlist: string[];
            };
            xai: { enabled: boolean; gatewayRoute: string; modelAllowlist: string[] };
        };
        redaction: { maxSummaryChars: number; redactPromptText: boolean };
        version: 1;
    };
}