feat: add marketplace metrics, privacy features, and service registry endpoints

- Add Prometheus metrics for marketplace API throughput and error rates with new dashboard panels
- Implement confidential transaction models with encryption support and access control
- Add key management system with registration, rotation, and audit logging
- Create services and registry routers for service discovery and management
- Integrate ZK proof generation for privacy-preserving receipts
- Add metrics instru

docs/user/getting-started/architecture.md

@@ -0,0 +1,52 @@
+---
+title: Architecture
+description: Technical architecture of the AITBC platform
+---
+
+# Architecture
+
+## Overview
+
+AITBC consists of several interconnected components that work together to provide a secure and efficient AI computing platform.
+
+## Components
+
+### Coordinator API
+The central service managing jobs, marketplace operations, and coordination.
+
+### Blockchain Nodes
+Maintain the distributed ledger and execute smart contracts.
+
+### Wallet Daemon
+Manages cryptographic keys and transactions.
+
+### Miners/Validators
+Execute AI computations and secure the network.
+
+### Explorer
+Browse blockchain data and transactions.
+
+## Data Flow
+
+```mermaid
+sequenceDiagram
+    participant U as User
+    participant C as Coordinator
+    participant M as Marketplace
+    participant B as Blockchain
+    participant V as Miner
+    
+    U->>C: Submit Job
+    C->>M: Find Offer
+    M->>B: Create Transaction
+    V->>B: Execute Job
+    V->>C: Submit Results
+    C->>U: Return Results
+```
+
+## Security Model
+
+- Cryptographic proofs for all computations
+- Multi-signature validation
+- Secure enclave support
+- Privacy-preserving techniques