Data provider simplification, tests, and documentation (#1997)

* Ignore env.test from source control

* Simplification of providers interface

* Synth tests

* Update money to use new find rates method

* Remove unused issues code

* Additional issue feature removals

* Update price data fetching and tests

* Update documentation for providers

* Security test fixes

* Fix self host test

* Update synth usage data access

* Remove AI pr schema changes

app/controllers/issue/exchange_rate_provider_missings_controller.rb

@@ -1,20 +0,0 @@
-class Issue::ExchangeRateProviderMissingsController < ApplicationController
-  before_action :set_issue, only: :update
-
-  def update
-    Setting.synth_api_key = exchange_rate_params[:synth_api_key]
-    account = @issue.issuable
-    account.sync_later
-    redirect_back_or_to account
-  end
-
-  private
-
-    def set_issue
-      @issue = Current.family.issues.find(params[:id])
-    end
-
-    def exchange_rate_params
-      params.require(:issue_exchange_rate_provider_missing).permit(:synth_api_key)
-    end
-end

app/controllers/issues_controller.rb

@@ -1,13 +0,0 @@
-class IssuesController < ApplicationController
-  before_action :set_issue, only: :show
-
-  def show
-    render template: "#{@issue.class.name.underscore.pluralize}/show", layout: "issues"
-  end
-
-  private
-
-    def set_issue
-      @issue = Current.family.issues.find(params[:id])
-    end
-end

app/controllers/securities_controller.rb

@@ -1,8 +1,8 @@
 class SecuritiesController < ApplicationController
   def index
-    @securities = Security.search_provider({
-      search: params[:q],
-      country: params[:country_code] == "US" ? "US" : nil
-    })
+    @securities = Security.search_provider(
+      params[:q],
+      country_code: params[:country_code] == "US" ? "US" : nil
+    )
   end
 end

app/controllers/settings/hostings_controller.rb

@@ -5,7 +5,7 @@ class Settings::HostingsController < ApplicationController
   before_action :ensure_admin, only: :clear_cache
 
   def show
-    @synth_usage = Current.family.synth_usage
+    @synth_usage = Providers.synth&.usage
   end
 
   def update