Rename project documentation: Bookmann → Bookhoard

Documentation updates:
- Update README.md title and all references
- Update PROJECT_GUIDELINES.md title and guidelines
- Update all documentation files in docs/ directory
- Update device setup guides (Kobo, KOReader)
- Update API and architecture documentation
- Update completion summaries and progress reports

This is part 5 of the project rename to Bookhoard.

docs/api/WEBSOCKET_API.md

@@ -70,7 +70,7 @@ const token = "your-jwt-token";
 const ws = new WebSocket(`ws://localhost:8765/ws/sync?token=${token}`);
 
 ws.onopen = () => {
-  console.log("Connected to Bookmann WebSocket");
+  console.log("Connected to Bookhoard WebSocket");
 };
 
 ws.onerror = (error) => {
@@ -489,7 +489,7 @@ ws.onclose = () => {
 ### Complete JavaScript Client
 
 ```javascript
-class BookmannWebSocket {
+class BookhoardWebSocket {
   constructor(token) {
     this.token = token;
     this.ws = null;
@@ -503,7 +503,7 @@ class BookmannWebSocket {
     this.ws = new WebSocket(url);
 
     this.ws.onopen = () => {
-      console.log("Connected to Bookmann");
+      console.log("Connected to Bookhoard");
       this.reconnectAttempts = 0;
     };
 
@@ -553,7 +553,7 @@ class BookmannWebSocket {
 
 // Usage
 const token = "your-jwt-token";
-const client = new BookmannWebSocket(token);
+const client = new BookhoardWebSocket(token);
 
 client.on("initial_state", (message) => {
   console.log("Initial state received:", message.data);
@@ -664,9 +664,9 @@ client.connect();
 ## Support
 
 For issues or questions:
-- GitHub Issues: [Bookmann Repository]
-- Documentation: [Bookmann Docs]
-- API Reference: [Bookmann API Docs]
+- GitHub Issues: [Bookhoard Repository]
+- Documentation: [Bookhoard Docs]
+- API Reference: [Bookhoard API Docs]
 
 ---