Let the studio book lessons and record intake collected elsewhere

Two related gaps, closed together because the second is created by the first.

A private lesson could only be booked by the student or their guardian, so a
booking taken over the phone had no way in — where group classes have had "Add
students directly" all along. "Book a lesson for a student" is now a panel on
Scheduler and My Lessons: student, open time, lesson type, with weekly term
reservations and a no-charge option for make-up lessons. The booking core is
extracted to Booking\LessonBooker and shared with POST /bookings, so the two
paths cannot drift on offering rules, slot claiming, or billing.

That leaves a registration with no intake answers and no policy acceptances,
because nobody was at a keyboard to give them — already true of every directly
added group-class student. Ticking the boxes on a student's behalf would be an
audit trail that says something untrue, so instead the answers are collected
another way and recorded afterwards, from a lesson's or an enrolment's detail
page. Every recording must say how it was collected, which is stamped on each
row along with who typed it and shown in a new "How it was given" column: a
policy ticked online and one transcribed from paper must never look alike.

Only staff-made registrations qualify (us_lessons.booked_by,
us_group_enrollments.enrolled_by) — one the student made already holds their
own answers. Only what is still missing can be recorded, re-checked at write
time, so a stale or double-posted form cannot duplicate or overwrite. No IP is
stored for a transcription, and accepted_by stays the student while recorded_by
names the staff member.

Intake is now generic over Registration\IntakeSubject, which Lesson and
Enrollment both implement; LessonDetail became Registration\IntakeAudit and is
shared by both detail views rather than duplicated.

Closes #182

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01QfHt6CyJHz6KkA4RuaS7WK

tests/Unit/Auth/StudentHistoryTest.php

@@ -98,7 +98,7 @@ class StudentHistoryTest extends TestCase
     public function testIntakeAnswersResolveQuestionLabels(): void
     {
         $this->answers->shouldReceive('findByStudent')->once()->with(5)->andReturn([
-            new Answer(4, Answer::REG_ENROLLMENT, 3, 5, 'Beginner', 1),
+            new Answer(4, Answer::REG_ENROLLMENT, 3, 5, 'Beginner', id: 1),
         ]);
         $this->questions->shouldReceive('findById')->with(4)
             ->andReturn(new Question(1, 'Experience level', id: 4));
@@ -120,7 +120,7 @@ class StudentHistoryTest extends TestCase
     public function testIntakeAnswersFallBackWhenQuestionIsGone(): void
     {
         $this->answers->shouldReceive('findByStudent')->once()->with(5)->andReturn([
-            new Answer(4, Answer::REG_LESSON, 12, 5, null, 1),
+            new Answer(4, Answer::REG_LESSON, 12, 5, null, id: 1),
         ]);
         $this->questions->shouldReceive('findById')->with(4)->andReturn(null);
 
@@ -133,8 +133,8 @@ class StudentHistoryTest extends TestCase
     public function testIntakeAnswersExcludeAccountScopeAnswers(): void
     {
         $this->answers->shouldReceive('findByStudent')->once()->with(5)->andReturn([
-            new Answer(9, Answer::REG_ACCOUNT, 5, 5, 'By a friend', 2),
-            new Answer(4, Answer::REG_LESSON, 12, 5, 'Beginner', 1),
+            new Answer(9, Answer::REG_ACCOUNT, 5, 5, 'By a friend', id: 2),
+            new Answer(4, Answer::REG_LESSON, 12, 5, 'Beginner', id: 1),
         ]);
         // Only the booking-scoped answer is resolved; the account answer is dropped.
         $this->questions->shouldReceive('findById')->with(4)
@@ -150,7 +150,7 @@ class StudentHistoryTest extends TestCase
     public function testRegistrationInfoPairsAccountQuestionsWithAnswers(): void
     {
         $this->answers->shouldReceive('findByRegistration')->once()->with(Answer::REG_ACCOUNT, 5)->andReturn([
-            new Answer(4, Answer::REG_ACCOUNT, 5, 5, 'Yes', 1),
+            new Answer(4, Answer::REG_ACCOUNT, 5, 5, 'Yes', id: 1),
         ]);
         $this->questions->shouldReceive('findByScope')->once()->with(Question::SCOPE_ACCOUNT)->andReturn([
             new Question(null, 'Consent to email', isRequired: true, scope: Question::SCOPE_ACCOUNT, id: 4),