feat: Introduce lists and reviews apps, refactor user list functionality from accounts, and add user profile fields.

IMPLEMENTATION_PLAN.md

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+# ThrillWiki Implementation Plan
+
+## User Review Required
+> [!IMPORTANT]
+> **Measurement Unit System**: The backend will store all values in **Metric**. The Frontend (Nuxt Composables) will handle conversion to Imperial based on user preference.
+> **Moderation Workflow**: A State Machine (Pending -> Claimed -> Approved) will be enforced for all user submissions.
+
+## Proposed Changes
+
+### Backend (Django + DRF)
+
+#### App Structure & Models
+- [x] **`apps/core`**: Base models (`SluggedModel`, `TimeStampedModel`), History (`pghistory`, `SlugHistory`), Utilities.
+- [x] **`apps/accounts`**: `User`, `UserProfile` (bio, location, visual prefs), `Auth` (MFA, Magic Link).
+- [x] **`apps/parks`**: `Park` (name, location, dates, status, owner/operator FKs).
+- [x] **`apps/rides`**:
+    - `Ride` (name, park FK, model FK, specs: height/speed/etc stored in metric).
+    - `Manufacturer`, `Designer`, `RideModel` (Company models).
+    - `RideCredit` (M2M: User <-> Ride). **Attributes**: `count`, `first_ridden_at`, `notes`, `ranking`.
+- [ ] **`apps/reviews`**: `Review` (User, Entity GenericFK, rating 1-5, text, helpful votes).
+- [ ] **`apps/media`**: `Photo` (image, user, caption, entity GenericFK), `Video`.
+- [x] **`apps/lists`**: `UserList` (Custom rankings/lists).
+- [x] **`apps/moderation`**: `Submission` (User, ContentType, Object ID, Changes JSON, Status: Pending/Claimed/Approved/Rejected, Moderator FK), `Report`.
+- [ ] **`apps/blog`**: `Post`, `Tag`.
+- [ ] **`apps/support`**: `Ticket` (Contact form).
+
+#### API & Logic
+- **DRF ViewSets**: Full CRUD for all entities (read-only for public, authenticated for mutations).
+- **Moderation Middleware/Signals**: Intercept mutations to create `Submission` records instead of direct saves for non-staff.
+- **Versioning**: `pghistory` and `SlugHistory` are already partially implemented in `core`.
+- **Search**: Global search endpoint.
+- **Geolocation**: `PostGIS` integrations (already partially in `parks.location_utils`).
+
+### Frontend (Nuxt 4)
+
+#### Architecture
+- **Directory Structure**:
+    - `app/pages/`: File-based routing (e.g., `parks/[slug].vue`).
+    - `app/components/`: Reusable UI components (Design System).
+    - `app/composables/`: Logic reuse (`useUnits`, `useAuth`, `useApi`).
+    - `app/stores/`: Pinia stores (`userStore`, `toastStore`).
+    - `app/layouts/`: `default.vue`, `auth.vue`.
+- **Tech Stack**: Nuxt 4, Nuxt UI (Tailwind based), Pinia, VueUse.
+
+#### Key Features & Composables
+- **`useUnits`**: Reactively converts metric props to imperial if user pref is set.
+- **`useAuth`**: Handles JWT/Session, MFA state, User fetching.
+- **`useModeration`**: For moderators to claim/approve actions.
+- **Forms**: `Zod` schema validation matching DRF serializers.
+
+#### Design System
+- **Theme**: Dark/Light mode support (built-in to Nuxt UI).
+- **Components**:
+    - `EntityCard` (Park/Ride summary).
+    - `StandardLayout` (Hero, Tabs, Content).
+    - `MediaGallery`.
+    - `ReviewList`.
+
+## Verification Plan
+
+### Automated Tests
+- **Backend**: `pytest` for Model constraints, API endpoints, and Moderation flow.
+- **Frontend**: `vitest` for Unit/Composable tests. E2E tests for critical flows (Submission -> Moderation -> Publish).
+
+### Manual Verification
+1. **Ride Credits**: User adds a ride, verifies count increments.
+2. **Moderation**: User submits data -> Mod claims -> Mod approves -> Public data updates.
+3. **Units**: Toggle preference, verify stats update (e.g., km/h -> mph).