docs: Rebuild documentation as enterprise-grade TLAS platform

- Migrate from custom HTTP server to VitePress framework
- Rename project to Tokenized License Approval System (TLAS)
- Add comprehensive documentation for all stakeholders:
  - Business: Executive summary, value proposition, governance
  - Operations: Infrastructure, installation, monitoring, backup
  - Departments: User guide, workflows, verification, issuance
  - Developers: API reference, authentication, webhooks, SDKs
  - Compliance: OWASP, DPDP Act, IT Act, audit framework
- Add modern theme with dark mode and full-text search
- Update Dockerfile for VitePress build process

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Documentation/overview/solution.md

@@ -0,0 +1,100 @@
+# Solution Architecture
+
+## System Overview
+
+```
+┌─────────────────────────────────────────────────────────────────────┐
+│                           TLAS Platform                              │
+├─────────────────────────────────────────────────────────────────────┤
+│  ┌──────────────┐  ┌──────────────┐  ┌──────────────┐              │
+│  │   Applicant  │  │  Department  │  │    Admin     │              │
+│  │    Portal    │  │    Portal    │  │   Console    │              │
+│  └──────┬───────┘  └──────┬───────┘  └──────┬───────┘              │
+│         │                 │                 │                       │
+│         └─────────────────┼─────────────────┘                       │
+│                           │                                         │
+│                    ┌──────▼───────┐                                 │
+│                    │  API Gateway │                                 │
+│                    │   (NestJS)   │                                 │
+│                    └──────┬───────┘                                 │
+│                           │                                         │
+│         ┌─────────────────┼─────────────────┐                       │
+│         │                 │                 │                       │
+│  ┌──────▼──────┐   ┌──────▼──────┐   ┌──────▼──────┐               │
+│  │  PostgreSQL │   │ Hyperledger │   │  External   │               │
+│  │  Database   │   │    Besu     │   │  Services   │               │
+│  └─────────────┘   └─────────────┘   └─────────────┘               │
+└─────────────────────────────────────────────────────────────────────┘
+```
+
+## Component Responsibilities
+
+| Component | Function |
+|-----------|----------|
+| **Applicant Portal** | Application submission, document upload, status tracking, certificate download |
+| **Department Portal** | Queue management, application review, approval actions, reporting |
+| **Admin Console** | Department onboarding, workflow configuration, system monitoring |
+| **API Gateway** | Authentication, authorization, request routing, rate limiting |
+| **PostgreSQL** | Application data, user accounts, workflow definitions, audit logs |
+| **Hyperledger Besu** | NFT minting, certificate verification, immutable transaction record |
+
+## Data Flow: License Issuance
+
+```
+1. Applicant submits application
+         │
+         ▼
+2. System validates documents and routes to workflow
+         │
+         ▼
+3. Officers process through defined approval stages
+         │
+         ▼
+4. Final approval triggers blockchain transaction
+         │
+         ▼
+5. NFT minted with license metadata
+         │
+         ▼
+6. Certificate generated with embedded verification QR
+         │
+         ▼
+7. Applicant notified and certificate available for download
+```
+
+## Blockchain Integration
+
+Hyperledger Besu serves as the certificate authority:
+
+- **Private network**: Government-controlled nodes, no public exposure
+- **Permissioned access**: Only authorized services can mint tokens
+- **Smart contract**: ERC-721 implementation for license NFTs
+- **Verification API**: Public endpoint for certificate validation
+
+### NFT Structure
+
+```json
+{
+  "tokenId": "0x...",
+  "licenseNumber": "GOA/TRADE/2026/00001",
+  "holder": {
+    "name": "Applicant Name",
+    "identifier": "AADHAAR-XXXX"
+  },
+  "issuingDepartment": "Department of Trade",
+  "issueDate": "2026-02-09",
+  "validUntil": "2027-02-08",
+  "documentHash": "SHA256:abcd1234..."
+}
+```
+
+## Security Architecture
+
+| Layer | Controls |
+|-------|----------|
+| **Network** | HTTPS only, WAF, DDoS protection |
+| **Authentication** | JWT tokens, session management, DigiLocker OAuth |
+| **Authorization** | Role-based access control, department isolation |
+| **Data** | Encryption at rest (AES-256), TLS 1.3 in transit |
+| **Application** | Input validation, SQL injection prevention, XSS protection |
+| **Audit** | Immutable logs, tamper detection, compliance reporting |