refactor: reorganize project structure and update configurations

- Move migrations/ to database/schema/ for clarity on database schema definitions
- Move sqlc.yaml to internal/database/ to group with database code
- Move static/ to cmd/server/static/ to co-locate with server
- Update all configuration files and documentation
- Follow Go project conventions for better organization

database/schema/001_create_tables.up.sql

@@ -0,0 +1,44 @@
+-- Create users table
+CREATE TABLE users (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    email VARCHAR(255) UNIQUE NOT NULL,
+    username VARCHAR(255) UNIQUE NOT NULL,
+    password_hash VARCHAR(255) NOT NULL,
+    theme VARCHAR(50) DEFAULT 'tokyo-night',
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+
+-- Create ebooks table
+CREATE TABLE ebooks (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    title VARCHAR(255) NOT NULL,
+    author VARCHAR(255),
+    isbn VARCHAR(13),
+    description TEXT,
+    file_path VARCHAR(500) NOT NULL,
+    file_size BIGINT,
+    mime_type VARCHAR(100),
+    cover_image_path VARCHAR(500),
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+
+-- Create reading_progress table
+CREATE TABLE reading_progress (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    ebook_id UUID NOT NULL REFERENCES ebooks(id) ON DELETE CASCADE,
+    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    current_page INTEGER DEFAULT 0,
+    total_pages INTEGER,
+    last_read_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    UNIQUE(ebook_id, user_id)
+);
+
+-- Create indexes
+CREATE INDEX idx_users_email ON users(email);
+CREATE INDEX idx_users_username ON users(username);
+CREATE INDEX idx_ebooks_title ON ebooks(title);
+CREATE INDEX idx_ebooks_author ON ebooks(author);
+CREATE INDEX idx_reading_progress_ebook_id ON reading_progress(ebook_id);
+CREATE INDEX idx_reading_progress_user_id ON reading_progress(user_id);

database/schema/002_add_ratings.up.sql

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+-- Add ebook ratings functionality
+CREATE TABLE ebook_ratings (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    ebook_id UUID NOT NULL REFERENCES ebooks(id) ON DELETE CASCADE,
+    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    rating INTEGER NOT NULL CHECK (rating >= 1 AND rating <= 5),
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    UNIQUE(ebook_id, user_id)
+);
+
+-- Create indexes for better query performance
+CREATE INDEX idx_ebook_ratings_ebook_id ON ebook_ratings(ebook_id);
+CREATE INDEX idx_ebook_ratings_user_id ON ebook_ratings(user_id);

database/schema/003_add_ebook_metadata_fields.up.sql

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+-- Add additional metadata fields to ebooks table
+ALTER TABLE ebooks ADD COLUMN series VARCHAR(255);
+ALTER TABLE ebooks ADD COLUMN series_number INTEGER;
+ALTER TABLE ebooks ADD COLUMN tags TEXT;
+ALTER TABLE ebooks ADD COLUMN asin VARCHAR(20);
+ALTER TABLE ebooks ADD COLUMN date_published DATE;
+ALTER TABLE ebooks ADD COLUMN publisher VARCHAR(255);
+ALTER TABLE ebooks ADD COLUMN contributors TEXT;

database/schema/004_add_ebook_folder_path.up.sql

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+-- Add ebook_folder_path to users table
+ALTER TABLE users ADD COLUMN ebook_folder_path VARCHAR(500);

database/schema/005_create_user_ebook_folders.up.sql

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+-- Create user_ebook_folders table for multiple folders per user
+CREATE TABLE user_ebook_folders (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    folder_path VARCHAR(500) NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    UNIQUE(user_id, folder_path)
+);
+
+-- Create index for faster lookups
+CREATE INDEX idx_user_ebook_folders_user_id ON user_ebook_folders(user_id);

database/schema/006_drop_ebook_folder_path.up.sql

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+-- Drop the old ebook_folder_path column from users table
+ALTER TABLE users DROP COLUMN IF EXISTS ebook_folder_path;

database/schema/007_add_scan_settings.up.sql

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+-- Add scan settings to users table
+ALTER TABLE users ADD COLUMN scan_frequency_minutes INTEGER DEFAULT 60;
+ALTER TABLE users ADD COLUMN auto_scan_enabled BOOLEAN DEFAULT true;

database/schema/008_add_user_names.up.sql

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+-- Add first and last name to users table
+ALTER TABLE users ADD COLUMN first_name VARCHAR(255);
+ALTER TABLE users ADD COLUMN last_name VARCHAR(255);

database/schema/normalize_folder_paths.sql

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+-- Normalize existing folder paths in user_ebook_folders table
+-- This script will clean up inconsistent path formatting
+
+UPDATE user_ebook_folders 
+SET folder_path = REPLACE(REPLACE(folder_path, '\\', '/'), '//', '/')
+WHERE folder_path LIKE '%\\%' OR folder_path LIKE '%//%';
+
+-- Remove trailing slashes from non-root paths
+UPDATE user_ebook_folders 
+SET folder_path = CASE 
+    WHEN folder_path = '/' THEN '/'
+    WHEN RIGHT(folder_path, 1) = '/' THEN LEFT(folder_path, LENGTH(folder_path) - 1)
+    ELSE folder_path
+END
+WHERE folder_path != '/' AND RIGHT(folder_path, 1) = '/';