Update documentation and API tests: Bookmann → Bookhoard

Documentation updates:
- All docs/ files: Update project references
- Bruno API collection: Update collection name and tests
- Device setup guides: Update all examples
- Implementation plan: Update database schema examples
- README files: Update project references

Part of project rename to Bookhoard.

docs/SECURITY_ENHANCEMENTS.md

@@ -284,8 +284,8 @@ e.Pre(
 
 ```go
 import (
-    "bookmann/internal/middleware"
-    "bookmann/internal/handlers"
+    "bookhoard/internal/middleware"
+    "bookhoard/internal/handlers"
 )
 
 func main() {
@@ -452,7 +452,7 @@ MAX_DEVICES_PER_USER=10
 **Step 3: Update Middleware Chain**
 ```go
 // Add to main.go middleware chain
-import "bookmann/internal/middleware"
+import "bookhoard/internal/middleware"
 
 // In main():
 securityMiddleware := middleware.HTTPSProtectionMiddleware(true, "8443")
@@ -594,4 +594,4 @@ While the system is production-ready, you may consider:
 
 **Implementation Completed**: January 31, 2026  
 **Next Review**: Within 3 months  
-**Questions**: security@bookmann.example.com
+**Questions**: security@bookhoard.example.com