Remove dead code: unused gems and locale keys

Verified-unreferenced removals (every grep below ran across
app/, lib/, config/ and matched only the definition site):

- gem "jbuilder" — no .jbuilder views, no JBuilder usage; all
  responses go through jsonapi-serializer
- gem "inline_svg" — no inline_svg helper calls anywhere
- locale `forgot_your_password` — no callers
- locale `send_me_reset_password_instructions` — no callers
- locale `api.shopkeeper.accounts.owner_required` — no callers
- locale `api.shopkeeper.accounts.admin_required` — no callers

Kept `validate_sign_up_params` / `validate_account_update_params`
overrides in RegistrationsController despite looking unused — the
parent class wires them up via `before_action` (verified in the
gem source).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: dadachi

Gemfile

@@ -20,9 +20,6 @@ gem "turbo-rails", "~> 2.0.3"
 # Hotwire's modest JavaScript framework [https://stimulus.hotwired.dev]
 gem "stimulus-rails", "~> 1.0", ">= 1.0.2"
 
-# Build JSON APIs with ease [https://github.com/rails/jbuilder]
-gem "jbuilder", "~> 2.14"
-
 # Solid adapters for queue, cache, and cable (database-backed, no Redis needed)
 gem "solid_queue"
 gem "solid_cable"
@@ -49,7 +46,6 @@ gem "aasm"
 gem "after_commit_everywhere", "~> 1.6"
 gem "config"
 gem "acts_as_tenant"
-gem "inline_svg", "~> 1.10"
 gem "pagy", "~> 43"
 gem "seed-fu", "~> 2.3"
 gem "whenever", require: false

Gemfile.lock

@@ -179,18 +179,12 @@ GEM
       activesupport (>= 6.0.0)
       railties (>= 6.0.0)
     iniparse (1.5.0)
-    inline_svg (1.10.0)
-      activesupport (>= 3.0)
-      nokogiri (>= 1.6)
     io-console (0.8.2)
     irb (1.17.0)
       pp (>= 0.6.0)
       prism (>= 1.3.0)
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
-    jbuilder (2.14.1)
-      actionview (>= 7.0.0)
-      activesupport (>= 7.0.0)
     json (2.19.3)
     json-schema (6.2.0)
       addressable (~> 2.8)
@@ -494,8 +488,6 @@ DEPENDENCIES
   erb_lint
   image_processing (~> 1.12)
   importmap-rails
-  inline_svg (~> 1.10)
-  jbuilder (~> 2.14)
   jsonapi-serializer
   madmin (~> 2.0)
   mailbin

config/locales/en.yml

@@ -32,8 +32,6 @@
 en:
   hello: "hello"
   welcome: "welcome"
-  forgot_your_password: "Forgot your password?"
-  send_me_reset_password_instructions: "Send me reset password instructions"
   change_my_password: "Change my password"
   change_your_password: "Change your password"
   confirm_new_password: "Confirm new password"
@@ -45,8 +43,6 @@ en:
   api:
     shopkeeper:
       accounts:
-        owner_required: "Only account owner is allowed to do that."
-        admin_required: "Only account admins are allowed to do that."
         personal:
           cannot_delete: "You cannot delete your personal account."
       accounts_invitations: