docs(luci-app-zkp): Add README with usage and protocol docs

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

package/secubox/luci-app-zkp/README.md

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+# LuCI ZKP Hamiltonian Dashboard
+
+Web interface for Zero-Knowledge Proof cryptography based on the Hamiltonian Cycle problem (Blum 1986).
+
+## Features
+
+- **Key Generation** - Create graph + Hamiltonian cycle pairs
+- **Proof Creation** - Generate NIZK proofs using Fiat-Shamir heuristic
+- **Verification** - Validate proofs with ACCEPT/REJECT result
+- **Key Management** - List, view, and delete saved keys
+
+## Screenshot
+
+```
+┌─────────────────────────────────────────────────────┐
+│  ZKP Hamiltonian Cryptography          [v1.0.0]    │
+├─────────────────────────────────────────────────────┤
+│  Saved Keys: 3    Max Nodes: 50    Hash: SHA3-256  │
+├─────────────────────────────────────────────────────┤
+│  🔑 Generate New Key                                │
+│  ┌──────────┐ ┌──────────┐ ┌──────────┐            │
+│  │ Name     │ │ Nodes    │ │ Density  │ [Generate] │
+│  │ my_key   │ │ 20       │ │ 0.8      │            │
+│  └──────────┘ └──────────┘ └──────────┘            │
+├─────────────────────────────────────────────────────┤
+│  🗂️ Saved Keys                                      │
+│  ┌─────────┬───────┬────────┬─────────┬──────────┐ │
+│  │ Name    │ Nodes │ Graph  │ Created │ Actions  │ │
+│  ├─────────┼───────┼────────┼─────────┼──────────┤ │
+│  │ test_1  │ 20    │ 1.2 KB │ 10:15   │ P  V  X  │ │
+│  │ demo    │ 30    │ 2.1 KB │ 09:30   │ P  V  X  │ │
+│  └─────────┴───────┴────────┴─────────┴──────────┘ │
+└─────────────────────────────────────────────────────┘
+```
+
+## Menu Location
+
+`Status > ZKP Cryptography`
+
+## Dependencies
+
+- `zkp-hamiltonian` - CLI tools (zkp_keygen, zkp_prover, zkp_verifier)
+- OpenSSL (for SHA3-256)
+
+## RPCD Methods
+
+| Method | Parameters | Description |
+|--------|------------|-------------|
+| `status` | - | Library version, key count, paths |
+| `keygen` | nodes, density, name | Generate graph + cycle |
+| `prove` | name | Create NIZK proof |
+| `verify` | name | Verify proof → ACCEPT/REJECT |
+| `list_keys` | - | List all saved keys |
+| `delete_key` | name | Delete key and files |
+| `get_graph` | name | Get graph metadata |
+
+## Usage
+
+### Generate a Key
+
+1. Enter a name for the key (e.g., `my_secret`)
+2. Select node count (4-50, default 20)
+3. Choose edge density (0.5-1.0, default 0.8)
+4. Click **Generate**
+
+### Create and Verify Proof
+
+1. Click **Prove** on a saved key
+2. Wait for proof generation
+3. Click **Verify** to validate
+4. Result shows **✅ ACCEPT** or **❌ REJECT**
+
+## File Storage
+
+```
+/var/lib/zkp/
+├── graphs/     # Binary graph files (.graph)
+├── keys/       # Hamiltonian cycle files (.key)
+└── proofs/     # Generated proofs (.proof)
+```
+
+## Protocol
+
+The ZKP protocol proves knowledge of a Hamiltonian cycle in a graph without revealing the cycle:
+
+1. **Prover** has graph G and secret Hamiltonian cycle H
+2. **Prover** creates random permutation π, computes G' = π(G)
+3. **Prover** commits to G' edges using SHA3-256
+4. **Challenge** derived via Fiat-Shamir (hash of G, G', commits)
+5. **Response** reveals either:
+   - Challenge=0: Permutation π (proves G ≅ G')
+   - Challenge=1: Cycle in G' (proves H exists)
+6. **Verifier** checks commitments and response
+
+Security: ~2^-128 soundness error with SHA3-256.
+
+## Building
+
+```bash
+# In OpenWrt buildroot
+make package/luci-app-zkp/compile V=s
+
+# Install
+opkg install luci-app-zkp_*.ipk
+```
+
+## Quick Deploy (Development)
+
+```bash
+# Deploy to router
+scp htdocs/luci-static/resources/view/zkp/overview.js root@192.168.255.1:/www/luci-static/resources/view/zkp/
+scp root/usr/libexec/rpcd/luci.zkp root@192.168.255.1:/usr/libexec/rpcd/
+ssh root@192.168.255.1 'killall rpcd; /etc/init.d/rpcd start'
+```
+
+## License
+
+GPL-2.0-or-later
+
+## Author
+
+SecuBox / CyberMind.FR