Finish MVP for content editing

db/migrate/20250528092931_create_editable_contents.rb

@@ -1,7 +1,7 @@
 class CreateEditableContents < ActiveRecord::Migration[8.0]
   def change
     create_table :editable_contents do |t|
-      t.string :path
+      t.string :context
       t.string :key
       t.string :lang, default: "en"
       t.text :content

db/schema.rb

@@ -65,7 +65,7 @@ ActiveRecord::Schema[8.0].define(version: 2025_05_28_092931) do
   end
 
   create_table "editable_contents", force: :cascade do |t|
-    t.string "path"
+    t.string "context"
     t.string "key"
     t.string "lang", default: "en"
     t.text "content"