chore: initial monorepo scaffold + WDS Phase 1+2 artifacts

- Nx 22.7 monorepo (pnpm 11.1, TypeScript 5.9, Node 24)
- apps/api: NestJS 11 (CJS conforme CODING-RULES.md PGD-DB-004)
- apps/web: React 19 + Vite 8 (ESM)
- libs/shared/api-interface: Zod contract base
- Docker Compose dev: Postgres 18, Valkey 8, MinIO, Mailpit
- WDS artifacts:
  - design-artifacts/A-Product-Brief/ (5 docs canônicos + 16 dialogs)
  - design-artifacts/B-Trigger-Map/ (hub + 4 personas + feature impact)
- Stack canon: STACK.md v2.2 + CODING-RULES.md v2.0 + brand.md
- AGENTS.md + README.md como entrada para devs/agentes

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

.agents/skills/wds-4-ux-design/data/modular-architecture/03-quick-refs/decision-tree.md

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+# Content Placement Decision Tree
+
+**One-page flowchart for file placement**
+
+---
+
+## The Decision Tree
+
+```
+┌─────────────────────────────────────────────────┐
+│  Does CONTENT vary by page context?             │
+│  (text, images, data source)                    │
+└────────────┬────────────────────────────────────┘
+             │
+      ┌──────┴──────┐
+      │             │
+     YES            NO
+      │             │
+      ▼             ▼
+┌─────────────┐  ┌──────────────┐
+│ Page File   │  │ Feature File │
+│             │  │              │
+│ Document:   │  │ Document:    │
+│ - Headings  │  │ - Generic    │
+│ - Text      │  │   content    │
+│ - Images    │  │ - Default    │
+│ - Data API  │  │   config     │
+│ - Scope     │  │              │
+└─────────────┘  └──────────────┘
+```
+
+---
+
+## Examples
+
+**Page File (Content Varies):**
+
+- ✅ Hero heading: "Welcome" (Home) vs "About" (About)
+- ✅ Search placeholder: "Search products..." vs "Search help..."
+- ✅ Calendar header: "Familjen Svensson: Vecka 40" (user's family)
+- ✅ Data API: `/api/families/:currentFamilyId/walks` (user-specific)
+
+**Feature File (Content Same Everywhere):**
+
+- ✅ Button text: "Submit" (always the same)
+- ✅ Error message: "Invalid email" (generic validation)
+- ✅ Tooltip: "Click to expand" (generic interaction)
+- ✅ Data API: `/api/products` (same for all users)
+
+---
+
+## Visual Design?
+
+```
+Is this VISUAL design (colors, spacing, states)?
+│
+└─ YES → Component File
+         (Colors, typography, layout, states)
+```
+
+---
+
+## Quick Rule
+
+- **Page File** = WHERE + WHAT (page-specific)
+- **Component File** = HOW IT LOOKS (visual design)
+- **Feature File** = WHAT IT DOES (functionality + generic content)