feat: Goa GEL Blockchain e-Licensing Platform - Full Stack Implementation

Complete implementation of the Goa Government e-Licensing platform with:

Backend:
- NestJS API with JWT authentication
- PostgreSQL database with Knex ORM
- Redis caching and session management
- MinIO document storage
- Hyperledger Besu blockchain integration
- Multi-department workflow system
- Comprehensive API tests (266/282 passing)

Frontend:
- Angular 21 with standalone components
- Angular Material + TailwindCSS UI
- Visual workflow builder
- Document upload with progress tracking
- Blockchain explorer integration
- Role-based dashboards (Admin, Department, Citizen)
- E2E tests with Playwright (37 tests)

Infrastructure:
- Docker Compose orchestration
- Blockscout blockchain explorer
- Development and production configurations

blockchain-architecture.mermaid

@@ -0,0 +1,75 @@
+graph TB
+    subgraph Network["Hyperledger Besu Network<br/>QBFT Consensus<br/>4 Validator Nodes"]
+        V1["🔐 Validator Node 1<br/>Port: 8545<br/>RPC Endpoint"]
+        V2["🔐 Validator Node 2<br/>Port: 8546"]
+        V3["🔐 Validator Node 3<br/>Port: 8547"]
+        V4["🔐 Validator Node 4<br/>Port: 8548"]
+    end
+
+    subgraph SmartContracts["Smart Contracts"]
+        LicenseNFT["📋 LicenseRequestNFT<br/>(ERC-721 Soulbound)<br/>• tokenId<br/>• licenseHash<br/>• metadata URI<br/>• issuerDept"]
+        ApprovalMgr["✅ ApprovalManager<br/>• recordApproval()<br/>• rejectRequest()<br/>• requestChanges()<br/>• getApprovalChain()"]
+        DeptRegistry["🏢 DepartmentRegistry<br/>• registerDept()<br/>• setApprovers()<br/>• getApprovers()<br/>• deptMetadata"]
+        WorkflowRegistry["⚙️ WorkflowRegistry<br/>• defineWorkflow()<br/>• getWorkflow()<br/>• workflowStates<br/>• transitions"]
+    end
+
+    subgraph OnChain["On-Chain Data"]
+        Accounts["💰 Accounts & Balances"]
+        NFTState["🎖️ NFT State<br/>tokenId → Owner<br/>tokenId → Metadata"]
+        Approvals["✅ Approval Records<br/>licenseHash → ApprovalChain"]
+    end
+
+    subgraph OffChain["Off-Chain Data<br/>PostgreSQL + MinIO"]
+        DocMeta["📄 Document Metadata<br/>• documentId<br/>• licenseHash<br/>• uploadedBy<br/>• uploadDate<br/>• status"]
+        LicenseReq["📋 License Request Details<br/>• requestId<br/>• applicantInfo<br/>• documents<br/>• notes"]
+        WorkflowState["⚙️ Workflow State<br/>• currentState<br/>• stateHistory<br/>• timestamps<br/>• transitions"]
+        DocFiles["📦 Actual Files<br/>• PDFs (MinIO)<br/>• Images<br/>• Proofs"]
+    end
+
+    subgraph DataLink["Data Linking"]
+        Hash["🔗 Content Hashing<br/>SHA-256<br/>Document → Hash<br/>Immutable Link"]
+    end
+
+    subgraph Consensus["Consensus: QBFT"]
+        QBFTInfo["Quorum Byzantine<br/>Fault Tolerant<br/>Requires 3/4 validators<br/>~1 block/12s"]
+    end
+
+    V1 -->|Peer Connection| V2
+    V1 -->|Peer Connection| V3
+    V1 -->|Peer Connection| V4
+    V2 -->|Peer Connection| V3
+    V2 -->|Peer Connection| V4
+    V3 -->|Peer Connection| V4
+
+    V1 -->|Deploy/Call| SmartContracts
+    V2 -->|Deploy/Call| SmartContracts
+    V3 -->|Deploy/Call| SmartContracts
+    V4 -->|Deploy/Call| SmartContracts
+
+    SmartContracts -->|Store State| OnChain
+    LicenseNFT -->|Emit Events| OnChain
+    ApprovalMgr -->|Record| OnChain
+    DeptRegistry -->|Maintain| OnChain
+    WorkflowRegistry -->|Track| OnChain
+
+    Hash -->|Link Via Hash| LicenseReq
+    Hash -->|Store Hash| OnChain
+    DocMeta -->|Contains Hash| Hash
+    LicenseReq -->|Store Details| OffChain
+    WorkflowState -->|Track Off-Chain| OffChain
+    DocFiles -->|Reference Via Hash| OffChain
+
+    Hash -.->|Immutable Anchor| NFTState
+    LicenseReq -.->|Linked to NFT| LicenseNFT
+
+    V1 -->|Consensus| Consensus
+    V2 -->|Consensus| Consensus
+    V3 -->|Consensus| Consensus
+    V4 -->|Consensus| Consensus
+
+    style Network fill:#dc2626,stroke:#991b1b,stroke-width:2px,color:#fff
+    style SmartContracts fill:#2563eb,stroke:#1e40af,stroke-width:2px,color:#fff
+    style OnChain fill:#7c3aed,stroke:#5b21b6,stroke-width:2px,color:#fff
+    style OffChain fill:#8b5cf6,stroke:#6d28d9,stroke-width:2px,color:#fff
+    style DataLink fill:#06b6d4,stroke:#0891b2,stroke-width:2px,color:#fff
+    style Consensus fill:#f59e0b,stroke:#d97706,stroke-width:2px,color:#fff