split angularjs application into components with routing dependency injection

so i didnt get any answers but after lots of playing around i figured out a solution.

Angularjs DI (dependency injection) for modules works as follows.

1. when you bootstrap a module -automatic using ng-app="module" or manually by triggering angular.bootstrap(document,"module"); the first thing that happens is that all its dependencies are looped and all config blocks run.

//i created a github example https://github.com/alzalabany/angular-material-modular-starter/

example :

angular.module('zalabany',['app.core','app.wall','app.blog']);
angular.bootstrap(document, ['zalabany']);
//1-->app.core config run, app.wall config run, app.blog config run, zalabany.config runs last
//2-->then .run blocks run in same order.

so since we are trying to be modular in nature. the core as i explained my question should depend on no other app module yet all other modules depends on it. so to do this, i used an intermediate module, that link them together.

Final code. -will upload git soon-

///Linking module, sole function is to connect all modules sharing same $rootScope and making sure system loads in correct order
angular.module('zalabany',['app.core','app.wall','app.blog']);

//I'm the Core.js i depend on external libs only. i'm not aware of my own system modules.
angular.module('app.core', ['ui.router', 'ngAnimate', 'toastr', 'ngMaterial','ngMdIcons'])
.config(function($stateProvider, $urlRouterProvider, $httpProvider) {
    ///http interceptor in case 403,401 on any request, redirect to login right away.
    $httpProvider.interceptors.push(function($q, $rootScope, $injector, $timeout, $window) {
        var toastr, $state, $http;
        //timeout is used to prevent circuler dependency error !
        $timeout(function() {
            toastr = $injector.get('toastr');
            $http = $injector.get('$http');
            $state = $injector.get('$state');
        });
        return {
            responseError: function(rejection) {
                if (rejection.data && rejection.data.hasOwnProperty('message')) {
                    toastr.error('request failed. try again later');
                }
                if (rejection.status === 401 || rejection.status === 403) {
                    console.log('rejected and redirecting', rejection);
                    $state.go('login');
                }
                return $q.reject(rejection);
            }
        };
    });

    $urlRouterProvider.otherwise("/login");

    $stateProvider
    .state('login', {
        url: "/login",
        templateUrl: "modules/core/login.html"
    });

    console.log('im config core');

})

.controller('loginCtrl', function($scope,$user,$rootScope){//remember $user is available every where
    var self=this;
    this.username = $user.username;


    if($user.token && $user.id){
        //validate token by sending get to auth.
        $http.defaults.headers.common["auth-token"] = $user.token;
        $http.defaults.headers.common["auth-uid"] = $user.id;

        $http.get($oauth).then(function(){$rootScope.Login($user);},$rootScope.Logout);

    }

    this.login= function(){
        $http.post($oauth,{username:self.username,password:self.password})
            .then(function(r){
                $rootScope.Login(r); //use login method on root to expose it for all modules
            });
    }
})

.run(function($rootScope, $state, $user,$http,$oauth) {
    ///$rootscope is shared between all modules. so i use it for sharing auth data since its just an object.
    $rootScope.$user = $user;

    $rootScope.$homepage = null;
    //default home page of appchild should overide it;
    //all children modules can edit this.


    ///FUNTION 1.
    ///LISTEN FOR ROUTE CHANGE AND PREVENT IF USER IS NOT LOGGED IN
    $rootScope.$on('$stateChangeStart', function(event, toState, toParams, fromState, fromParams) {

        if (!$rootScope.$user.hasOwnProperty('token') && toState.name !== 'login') {
            console.log('prevented');
            event.preventDefault();
            $state.go('login');
        }
    });


    $rootScope.Login = function(r){
    // login login ...
      $http.defaults.headers.common["auth-uid"] = r.token;
        angular.module('zalabany').value('$user',r);

        console.log('oki lets go hom',$state.go($rootScope.$homepage));
    }

    $rootScope.Logout = function(){
        window.localStorage.clear();
        $state.go('login');
    }

});


///BOOTSTRAP
$(function(){
    $.getJSON('PING API WITH TOKEN FROM LOCALSTORAGE', function(json) {
        $user = json || data;//json is our user record
    }).fail(function() {
        $user=data;
        window.localStorage.clear();
        console.log( "login error" );
    }).always(function() {
        angular.module('app.core')
                .value('$user',$user);
        angular.bootstrap(document, ['zalabany']); //bootstrap the link module
    });
});

from now on to adding new component to my app is as easy as

angular.module('app.wall', ['app.core'])
.config(function($stateProvider, $urlRouterProvider, $httpProvider) {

    $stateProvider
    .state('wall', {
        url: "/wall",
        templateUrl: "modules/wall/wall.html"
    });
})

.run(function($rootScope, $state, $user,$http,$oauth) {
    $rootScope.$homepage = 'wall';//Set homepage to me
    // or i can use
    $rootScope.$homepage = $rootScope.$homepage || 'wall';//set homepage to me if no other modules declared it it.

   //Push me into the sidebar.
   $rootScope.$sidebar.push({order:1, link:'/wall',title:'Feed',icon:'fa fa-star'});
});

Benefit of this structure :- 1. i hv $user info available for all modules, 2. module push it self to sidebar , 3. routes are declared inside each module in its own config block. 4. adding new module i create new folder, add link to linking module "zalabany in this example". and i'm good to go, with authentication and everything :-)