Add Billet entity, BilletDesign, ticket designer, CRUD billets, commissions

- Create Billet entity: name, position, priceHT, quantity (nullable=unlimited),
  isGeneratedBillet, hasDefinedExit, notBuyable, type (billet/reservation_brocante/vote),
  stripeProductId, description, picture (VichUploader), category (ManyToOne CASCADE)
- Create BilletDesign entity (OneToOne Event): accentColor, invitationTitle, invitationColor
- Billet CRUD: add/edit/delete with access control, Stripe product sync on connected account
- Billet reorder: drag & drop with position field, refactored sortable.js for both categories and billets
- Ticket designer tab (custom offer only): accent color, invitation title/color, live iframe preview
- A4 ticket preview: 4 zones (HG infos+billet, HD affiche, BG association, BD sortie+invitation), fake QR code SVG
- Commission calculator JS: live breakdown of E-Ticket fee, Stripe fee (1.5%+0.25EUR), net amount
- Sales recap on categories tab: qty sold, total HT, total commissions, total net
- DisableProfilerSubscriber: disable web profiler toolbar on preview iframe
- CSP: allow self in frame-src and frame-ancestors for preview iframe
- Flysystem: dedicated billets.storage for billet images
- Upload accept restricted to png/jpeg/webp/gif (no HEIC)
- Makefile: add force_sql_dev command
- CLAUDE.md: add rule to never modify existing migrations
- Consolidate all migrations into single Version20260321111125
- Tests: BilletTest (20), BilletDesignTest (6), DisableProfilerSubscriberTest (5),
  billet-designer.test.js (7), commission-calculator.test.js (7),
  AccountControllerTest billet CRUD tests (11)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

config/packages/flysystem.yaml

@@ -5,6 +5,11 @@ flysystem:
             options:
                 directory: '%kernel.project_dir%/public/uploads/events'
 
+        billets.storage:
+            adapter: 'local'
+            options:
+                directory: '%kernel.project_dir%/public/uploads/billets'
+
         logos.storage:
             adapter: 'local'
             options:

config/packages/nelmio_security.yaml

@@ -20,8 +20,9 @@ nelmio_security:
                 enabled: false
             report-uri: '%router.request_context.base_url%/my-csp-report'
             frame-ancestors:
-                - 'none'
+                - 'self'
             frame-src:
+                - 'self'
                 - 'https://stripe.com'
                 - 'https://*.stripe.com'
                 - 'https://js.stripe.com'

config/packages/vich_uploader.yaml

@@ -10,6 +10,11 @@ vich_uploader:
             upload_destination: default.storage
             namer: Vich\UploaderBundle\Naming\SmartUniqueNamer
 
+        billet_image:
+            uri_prefix: /uploads/billets
+            upload_destination: billets.storage
+            namer: Vich\UploaderBundle\Naming\SmartUniqueNamer
+
         organizer_logo:
             uri_prefix: /uploads/logos
             upload_destination: logos.storage