docs: update comprehensive API documentation and project guides

This commit updates all documentation files throughout the project:

- Updated IMPLEMENTATION_PLAN.md with new implementation details
- Updated PROJECT_GUIDELINES.md with coding standards and practices
- Updated README.md with current project information
- Updated SCREENSHOT_AUTOMATION.md with new automation details
- Added TEST_DATA.md with test fixtures data
- Updated cover_image_serving_plan.md with static URL patterns

Documentation API updates:
- Updated API reference documentation for all endpoints including:
  - Authentication (login, logout, register, refresh_token)
  - Book matching (auto_link, bulk_link, link_book, search)
  - Collections (CRUD operations, shelf mappings, auto-assign rules)
  - Conflicts (bulk operations, resolve/dismiss)
  - Devices (registration, approval, shelf management)
  - Highlights (create, update, delete, get)
  - Kobo sync (bookmark, markup, initialization, sync)
  - KOReader sync (library, metadata, bookmarks, progress)
  - Libraries (CRUD, folders, media items, stats)
  - Media items (bulk operations, CRUD)
  - Notes (CRUD operations)
  - OPDS (acquisition, feeds, publication)
  - Progress (reading progress tracking)
  - Queue (device queue management)
  - Ratings (star ratings)
  - Scanner (watch mode, scan operations)
  - Sync protocols (Kobo, KOReader)
  - Users (profile, password, admin operations)
  - WebSocket protocols

- Updated user guides (admin, dashboard, settings, sync)
- Updated device setup guides (Kobo, KOReader)
- Updated developer guides (testing, contributing, operations)
- Updated scripts/README.md

README.md

@@ -17,6 +17,7 @@ A modern self-hosted media library system built with Go, PostgreSQL, HTMX, and T
 ## 🚀 Quick Start
 
 ### Prerequisites
+
 - **Podman** (recommended) or Docker
 - **5 minutes** of your time
 
@@ -48,6 +49,7 @@ The first user to register automatically becomes an admin.
 ## 📖 Key Features
 
 ### Universal Cross-Platform Sync
+
 - **Real-Time Progress**: Turn a page on your Kindle, see it on your phone
 - **Format-Aware**: EPUB CFI, page numbers, percentages - all handled correctly
 - **Offline Queue**: Changes sync when you reconnect, priority-processed
@@ -57,6 +59,7 @@ The first user to register automatically becomes an admin.
 - **Format Conversion**: On-the-fly EPUB→KEPUB for Kobo devices
 
 ### Media Management
+
 - **Smart Search**: Partial matching with fuzzy search fallback for typos
 - **Advanced Filtering**: Filter by author, series, genre, language, year, cover images
 - **Dynamic Sorting**: By title, author, date added, published date, page count, series
@@ -66,11 +69,13 @@ The first user to register automatically becomes an admin.
 - **Usage Analytics**: Reading statistics, device usage, popular books
 
 ### Smart Collections
+
 - **Auto-Assign Rules**: Automatically add books based on genre, author, series, tags, language, publisher, year
 - **Device Shelf Mappings**: Sync collections to Kobo shelves and KOReader categories
 - **Test Before Creating**: Preview which books match your rules
 
 ### Library Organization
+
 - **Multi-Library Support**: Ebooks, Comics, and Manga with type-specific file formats
 - **Multiple Folders**: Add multiple scanning folders per library
 - **Visibility Control**: Admins control which libraries each user can see
@@ -78,6 +83,7 @@ The first user to register automatically becomes an admin.
 - **Watch Mode**: Real-time file system monitoring for instant updates
 
 ### Security
+
 - **JWT Authentication**: Short-lived access tokens (1 hour) with refresh tokens (7 days)
 - **Strong Passwords**: Complexity requirements enforced (8+ chars, uppercase, lowercase, number, special)
 - **Account Lockout**: 5 failed attempts = 15-minute lockout
@@ -90,6 +96,7 @@ The first user to register automatically becomes an admin.
 ## 📚 Documentation
 
 ### For Users & Self-Hosters
+
 - **[docs/user/sync-guide.md](docs/user/sync-guide.md)** - Understanding and using universal sync
 - **[docs/user/devices/kobo-setup.md](docs/user/devices/kobo-setup.md)** - Kobo e-reader configuration
 - **[docs/user/devices/koreader-setup.md](docs/user/devices/koreader-setup.md)** - KOReader configuration
@@ -98,6 +105,7 @@ The first user to register automatically becomes an admin.
 - **[docs/user/settings-guide.md](docs/user/settings-guide.md)** - Settings and preferences
 
 ### For Developers
+
 - **[docs/developer/api/api-reference.md](docs/developer/api/api-reference.md)** - Complete API documentation
 - **[docs/contributing/DEVELOPMENT.md](docs/contributing/DEVELOPMENT.md)** - Development workflow
 
@@ -105,12 +113,12 @@ The first user to register automatically becomes an admin.
 
 ## 🎯 Supported Devices
 
-| Platform | Sync | OPDS | Status |
-|----------|------|------|--------|
-| **Web Browser** | ✅ | ✅ | Full support |
-| **KOReader** | ✅ | ✅ | Kindle, Kobo, PocketBook |
-| **Kobo Devices** | ✅ | ✅ | Clara, Libra, Sage, etc. |
-| **Mobile Apps** | 🚧 | 🚧 | Coming Q2 2026 |
+| Platform         | Sync | OPDS | Status                   |
+| ---------------- | ---- | ---- | ------------------------ |
+| **Web Browser**  | ✅   | ✅   | Full support             |
+| **KOReader**     | ✅   | ✅   | Kindle, Kobo, PocketBook |
+| **Kobo Devices** | ✅   | ✅   | Clara, Libra, Sage, etc. |
+| **Mobile Apps**  | 🚧   | 🚧   | Coming Q2 2026           |
 
 ---