Add local management architecture and search engine metadata

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+# Local Management Interface
+
+## Overview
+
+NX9 follows a **CLI-first** philosophy.
+
+Every application is designed to be fully manageable from the command line. The CLI is considered the authoritative interface for administration, automation, scripting, backups, diagnostics, and system integration.
+
+To complement—not replace—the CLI, every NX9 application may expose a **Local Management Interface**: a lightweight web UI intended exclusively for administrators operating on the local machine.
+
+Unlike traditional web applications, the Local Management Interface is **never intended for public access**. It is bound only to the loopback interface (`127.0.0.1`) and provides a graphical representation of the same administrative capabilities already available through the CLI.
+
+The web interface exists purely for convenience and visualization. It should never become a dependency for operating an NX9 application.
+
+---
+
+# Motivation
+
+Most modern web applications expose both public and administrative functionality through the same web server.
+
+```
+Internet
+     │
+     ▼
+ Public Web Server
+     │
+ ┌───┴──────────────┐
+ │                  │
+ ▼                  ▼
+Public Pages    Admin Pages
+                Debug APIs
+                Metrics
+                Configuration
+                Logs
+```
+
+These administrative endpoints are typically protected using:
+
+- Authentication
+- Authorization
+- Middleware
+- Reverse proxies
+- VPNs
+- Firewalls
+
+While effective, this approach increases complexity and permanently enlarges the public attack surface.
+
+NX9 takes a different approach.
+
+Administrative functionality simply does **not exist** on the public interface.
+
+---
+
+# Architecture
+
+Each NX9 application exposes two completely independent interfaces.
+
+```
+                    Internet
+                        │
+                        ▼
+         Public Interface (0.0.0.0:<base-port>)
+                        │
+                        ▼
+                 Public Router
+                        │
+        ┌───────────────┴───────────────┐
+        │                               │
+   Static Website                 Public APIs
+        │                               │
+        ▼                               ▼
+   End Users                      API Clients
+
+
+──────────────────────────────────────────────────────
+
+
+                  Local Machine
+                        │
+                        ▼
+ Local Management Interface (127.0.0.1:<base-port+1>)
+                        │
+                        ▼
+                  Admin Router
+                        │
+      ┌─────────────┼─────────────┐
+      │             │             │
+ Dashboard      Diagnostics    Configuration
+ Logs           Health         Maintenance
+ Metrics        Backup         Monitoring
+```
+
+Each interface owns its own TCP listener and its own HTTP router.
+
+The application core remains shared.
+
+---
+
+# Two Independent TCP Listeners
+
+A typical implementation looks like:
+
+```rust
+let public = TcpListener::bind("0.0.0.0:8654").await?;
+let admin  = TcpListener::bind("127.0.0.1:8655").await?;
+```
+
+Both listeners execute within the same process.
+
+No second daemon.
+
+No management service.
+
+No sidecar container.
+
+No IPC.
+
+One executable.
+
+One process.
+
+Two trust boundaries.
+
+---
+
+# Public Interface
+
+The public listener serves Internet-facing functionality.
+
+Typical routes include:
+
+```
+/
+robots.txt
+sitemap.xml
+API endpoints
+Public documentation
+Static assets
+```
+
+Nothing more.
+
+No dashboards.
+
+No configuration.
+
+No maintenance.
+
+No diagnostics.
+
+No hidden administration pages.
+
+---
+
+# Local Management Interface
+
+The local listener provides a graphical representation of administrative functionality.
+
+Typical capabilities include:
+
+- Dashboard
+- Application status
+- Runtime metrics
+- Memory usage
+- CPU utilisation
+- Active connections
+- Live logs
+- Configuration viewer
+- Configuration editor
+- Database browser
+- Backup & Restore
+- Maintenance operations
+- Health monitoring
+- Diagnostics
+- Version information
+- Build information
+
+Everything accessible through the Local Management Interface should also be available through the CLI.
+
+The web UI is an additional convenience layer—not an alternative management interface.
+
+---
+
+# CLI First
+
+The CLI remains the primary interface for:
+
+- Automation
+- Scripting
+- SSH administration
+- CI/CD pipelines
+- Cron jobs
+- Disaster recovery
+- Headless deployments
+
+Typical workflow:
+
+```
+Automation
+Scripts
+SSH
+CI/CD
+        │
+        ▼
+       CLI
+        │
+        ▼
+ Application Core
+        ▲
+        │
+Local Management Interface
+```
+
+An NX9 application must remain fully operable without ever opening a browser.
+
+---
+
+# Security Model
+
+NX9 intentionally separates administration from public services.
+
+Administrative routes are never registered on the public listener.
+
+For example, the following routes may exist only on the Local Management Interface:
+
+```
+/dashboard
+/config
+/logs
+/metrics
+/backup
+/database
+/maintenance
+/diagnostics
+```
+
+A request arriving on the public interface can never reach these endpoints because they simply do not exist within the public router.
+
+There is nothing to authenticate.
+
+Nothing to authorize.
+
+Nothing to accidentally expose.
+
+This follows one of the fundamental NX9 principles:
+
+> **The smallest attack surface is the one that was never exposed.**
+
+---
+
+# Why Not Authentication?
+
+Authentication remains valuable when multiple local users require different permissions.
+
+However, authentication should not compensate for architectural decisions.
+
+Instead of exposing administration endpoints publicly and protecting them with increasingly complex security layers, NX9 removes them from the public interface entirely.
+
+The Internet cannot attack endpoints that do not exist.
+
+---
+
+# Design Principles
+
+The Local Management Interface follows several architectural principles.
+
+## CLI First
+
+The CLI remains the complete administrative interface.
+
+The web UI complements it.
+
+---
+
+## Network-Level Isolation
+
+Administrative functionality exists only on the loopback interface.
+
+No Internet exposure.
+
+No reverse proxy.
+
+No TLS requirement.
+
+No public routing.
+
+---
+
+## Single Binary
+
+Every NX9 application remains a single executable.
+
+The management interface is built into the application itself.
+
+---
+
+## Lightweight
+
+The management interface should be:
+
+- HTML5
+- CSS3
+- Vanilla JavaScript
+
+No frontend frameworks.
+
+No Node.js runtime.
+
+No build pipeline.
+
+No npm dependencies.
+
+---
+
+## Responsive
+
+The interface should function equally well on:
+
+- Desktop
+- Tablet
+- Mobile browser
+
+Administrators should be able to inspect an application quickly from any modern browser.
+
+---
+
+# Typical Features
+
+The Local Management Interface may provide:
+
+## System
+
+- Application information
+- Version
+- Build date
+- Uptime
+- Runtime
+
+## Monitoring
+
+- CPU
+- Memory
+- Active sessions
+- Connections
+- Queue sizes
+
+## Logging
+
+- Live logs
+- Error logs
+- Audit logs
+- Request logs
+
+## Database
+
+- Browse records
+- Execute maintenance
+- Backup
+- Restore
+
+## Configuration
+
+- View configuration
+- Edit configuration
+- Reload configuration
+
+## Diagnostics
+
+- Health checks
+- Dependency status
+- Environment
+- Runtime diagnostics
+
+---
+
+# Suggested Port Convention
+
+NX9 applications commonly reserve consecutive ports.
+
+| Application | Public | Local Management |
+|------------|--------:|-----------------:|
+| BZOD | 8654 | 8655 |
+| ChronoSeal | 8383 | 8384 |
+| nx9-auth | 9010 | 9011 |
+| IoT Hub | 18800 | 18801 |
+
+This convention keeps deployments predictable while remaining easy to remember.
+
+---
+
+# Future Possibilities
+
+Future NX9 applications may expose lightweight machine-readable metadata.
+
+Example:
+
+```
+GET /.nx9/status
+```
+
+```json
+{
+    "application": "BZOD",
+    "version": "0.5.3",
+    "status": "healthy",
+    "uptime": "18d 07h",
+    "database": "SQLite"
+}
+```
+
+This would enable a future **NX9 Local Dashboard** to automatically discover and monitor every NX9 application running on a machine.
+
+Because every application follows the same architecture, discovery becomes trivial.
+
+---
+
+# Philosophy
+
+The Local Management Interface embodies several core NX9 principles.
+
+- **CLI-first**
+- **Web UI as a convenience**
+- **Network-level isolation**
+- **Single binary deployment**
+- **Minimal attack surface**
+- **No unnecessary dependencies**
+- **Operational simplicity**
+
+Rather than protecting administrative functionality behind increasingly sophisticated security mechanisms, NX9 reduces complexity through architectural separation.
+
+The result is software that is easier to understand, easier to operate, easier to secure, and remains faithful to the guiding philosophy of the NX9 ecosystem:
+
+> **Expose only what must be public. Everything else belongs on localhost.**