Add park detail API and detail page implementation with loading states and error handling

memory-bank/features/park_detail_api.md

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+# Park Detail API Implementation
+
+## Overview
+Implementing the park detail API endpoint at `/api/parks/[slug]` to provide detailed information about a specific park.
+
+## Implementation Details
+- Route: `/api/parks/[slug]/route.ts`
+- Response Type: `ParkDetailResponse` (already defined in api.ts)
+- Error Handling:
+  - 404 for invalid park slugs
+  - 500 for server/database errors
+
+## Data Structure
+Reusing existing Park type with full relationships:
+- Basic park info (name, description, etc.)
+- Areas
+- Reviews with user info
+- Photos with user info
+- Creator details
+- Owner (company) details
+
+## Date Formatting
+Following established pattern:
+- Split ISO dates at 'T' for date-only fields
+- Full ISO string for timestamps