feat: project cover art with AI generation, branding rename, RBAC fix, computation graph

- Add DALL-E cover art generation for projects (Azure OpenAI + standard OpenAI)
- CoverArtSection component with generate/upload/remove/focus-point controls
- Client-side image compression (10MB input → WebP/JPEG, max 1920px)
- DALL-E settings in admin panel (deployment, endpoint, API key)
- MCP assistant tools for cover art (generate_project_cover, remove_project_cover)
- Rename "Planarchy" → "plANARCHY" across all UI-facing text (13 files)
- Fix hardcoded canEdit={true} on project detail page — now checks user role
- Computation graph visualization (2D/3D) for calculation rules
- OG image and OpenGraph metadata

Co-Authored-By: claude-flow <ruv@ruv.net>

packages/db/prisma/schema.prisma

@@ -807,6 +807,8 @@ model Project {
   status          ProjectStatus  @default(DRAFT)
   responsiblePerson String?
   color             String?           // Hex color for timeline display, e.g. "#3b82f6"
+  coverImageUrl     String?  @db.Text // Base64 data-URL for project cover art
+  coverFocusY       Int      @default(50) // Vertical focus point 0-100 (% from top)
 
   // staffingReqs: StaffingRequirement[]
   staffingReqs    Json           @db.JsonB @default("[]")
@@ -1332,6 +1334,10 @@ model SystemSettings {
   anonymizationAliases    Json?    @db.JsonB
   // Vacation defaults
   vacationDefaultDays     Int?     @default(28)  // default annual entitlement
+  // DALL-E image generation (Azure requires separate deployment)
+  azureDalleDeployment    String?  // e.g. "dall-e-3" — Azure DALL-E deployment name
+  azureDalleEndpoint      String?  // Optional: separate endpoint for DALL-E (if different from chat)
+  azureDalleApiKey        String?  // Optional: separate API key for DALL-E
   updatedAt               DateTime @updatedAt
 
   @@map("system_settings")