Update database schema and queries: Bookmann → Bookhoard

Database changes:
- schema.sql: Update column name bookmann_uuid → bookhoard_uuid
- schema.sql: Update index names and example URLs
- queries.sql: Update all SQL queries to use bookhoard_uuid
- Update example configuration values

Part of project rename to Bookhoard.

database/schema/schema.sql

@@ -867,7 +867,7 @@ CREATE TABLE IF NOT EXISTS device_catalogs (
     id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
     device_id UUID NOT NULL REFERENCES devices(id) ON DELETE CASCADE,
     media_item_id UUID NOT NULL REFERENCES media_items(id) ON DELETE CASCADE,
-    bookmann_uuid UUID NOT NULL,
+    bookhoard_uuid UUID NOT NULL,
     kobo_content_id VARCHAR(255) NOT NULL,
     content_id_type VARCHAR(20),
     available BOOLEAN DEFAULT TRUE,
@@ -876,7 +876,7 @@ CREATE TABLE IF NOT EXISTS device_catalogs (
     UNIQUE(device_id, kobo_content_id)
 );
 
-CREATE INDEX IF NOT EXISTS idx_device_catalogs_bookmann ON device_catalogs(bookmann_uuid);
+CREATE INDEX IF NOT EXISTS idx_device_catalogs_bookhoard ON device_catalogs(bookhoard_uuid);
 CREATE INDEX IF NOT EXISTS idx_device_catalogs_kobo ON device_catalogs(kobo_content_id);
 
 -- Create system_config table (system-wide configuration)
@@ -889,9 +889,9 @@ CREATE TABLE IF NOT EXISTS system_config (
 
 -- Pre-seeded values
 INSERT INTO system_config (key, value) VALUES
-('base_url', 'https://bookmann.example.com'),
-('opds_base_url', 'https://bookmann.example.com/opds'),
-('api_base_url', 'https://bookmann.example.com/api')
+('base_url', 'https://bookhoard.example.com'),
+('opds_base_url', 'https://bookhoard.example.com/opds'),
+('api_base_url', 'https://bookhoard.example.com/api')
 ON CONFLICT (key) DO NOTHING;
 
 -- Create opds_tokens table (device-specific OPDS access tokens)