feat: add global ticket capacity for conferences

[JacobCoffee]

Summary

• Adds total_capacity field on Conference model (0 = unlimited, matching TicketType.total_quantity convention)
• New registration/services/capacity.py with get_global_sold_count(), get_global_remaining(), and validate_global_capacity()
• Enforced at cart-add, update-quantity, and checkout revalidation (add-ons excluded from count)
• Supported in bootstrap command, admin, manage UI (capacity banner + form field), and example TOML

Test plan

• Unit tests for all 3 capacity functions (empty, paid/refunded/pending counting, add-on exclusion, no-limit bypass, over-cap error)
• Cart integration: add_ticket respects/bypasses global cap, update_quantity respects cap, multi-ticket-type cap
• Checkout integration: revalidation catches oversell between cart-add and checkout
• Bootstrap with/without total_capacity
• TicketTypeListView context includes/excludes global capacity info
• All 1191 tests pass, lint/format/type-check clean

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[Copilot]

Pull request overview

Adds a conference-wide “global” ticket capacity (Conference.total_capacity) and enforces it across the registration flow (cart add/update + checkout revalidation), with corresponding admin/manage UI support and bootstrap config wiring.

Changes:

• Introduces Conference.total_capacity (0 = unlimited) with migration, admin/manage form + template updates, and TOML bootstrap support.
• Adds registration/services/capacity.py to compute sold/remaining and validate requests against the global cap.
• Integrates global-cap validation into cart and checkout flows, and adds unit + integration tests covering the new behavior.

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tests/test_registration/test_checkout_service.py	Adds checkout-level integration test to ensure global capacity is revalidated during checkout.
tests/test_registration/test_cart_service.py	Adds cart integration tests for add/update quantity enforcement under a global cap.
tests/test_registration/test_capacity.py	New unit tests for global capacity counting/remaining/validation helpers.
tests/test_manage/test_views.py	Adds manage view tests for including/excluding global capacity info in context.
tests/test_manage/test_forms.py	Ensures total_capacity is included in conference manage form fields and accepts valid input.
tests/test_conference/test_bootstrap_command.py	Adds bootstrap tests to set/default total_capacity from TOML config.
src/django_program/registration/services/checkout.py	Adds checkout revalidation helper for global capacity.
src/django_program/registration/services/cart.py	Enforces global capacity during add_ticket and update_quantity; adds cart ticket-qty aggregation helper.
src/django_program/registration/services/capacity.py	New service module implementing sold count / remaining / validation.
src/django_program/manage/views.py	Exposes global capacity + sold count in ticket type list view context when enabled.
src/django_program/manage/templates/django_program/manage/ticket_type_list.html	Displays a capacity banner when global capacity is set.
src/django_program/manage/templates/django_program/manage/conference_edit.html	Adds a “Capacity” fieldset with total_capacity form field.
src/django_program/manage/forms.py	Adds total_capacity to conference manage form Meta fields.
src/django_program/conference/models.py	Adds total_capacity field to Conference model (0 = unlimited).
src/django_program/conference/migrations/0004_add_total_capacity.py	Migration to add total_capacity to the Conference table.
src/django_program/conference/management/commands/bootstrap_conference.py	Maps TOML total_capacity into conference creation/update.
src/django_program/conference/admin.py	Adds total_capacity to admin fieldset for Conference.
conference.example.toml	Documents total_capacity in the example configuration.

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[Copilot]

Pull request overview

Copilot reviewed 19 out of 19 changed files in this pull request and generated 3 comments.

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