Update admin UI with real API integration and secret management

test_keypairs.md

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+# Test Keypairs for Supervisor Auth
+
+These are secp256k1 keypairs for testing the supervisor authentication system.
+
+## Keypair 1 (Alice - Admin)
+```
+Private Key: 0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef
+Public Key:  0x04a34b99f22c790c4e36b2b3c2c35a36db06226e41c692fc82b8b56ac1c540c5bd5b8dec5235a0fa8722476c7709c02559e3aa73aa03918ba2d492eea75abea235
+Address:     0x1234567890abcdef1234567890abcdef12345678
+```
+
+## Keypair 2 (Bob - User)
+```
+Private Key: 0xfedcba0987654321fedcba0987654321fedcba0987654321fedcba0987654321
+Public Key:  0x04d0de0aaeaefad02b8bdf8a56451a9852d7f851fee0cc8b4d42f3a0a4c3c2f66c1e5e3e8e3c3e3e3e3e3e3e3e3e3e3e3e3e3e3e3e3e3e3e3e3e3e3e3e3e3e3e3e
+Address:     0xfedcba0987654321fedcba0987654321fedcba09
+```
+
+## Keypair 3 (Charlie - Register)
+```
+Private Key: 0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+Public Key:  0x04e68acfc0253a10620dff706b0a1b1f1f5833ea3beb3bde6250d4e5e1e283bb4e9504be11a68d7a263f8e2000d1f8b8c5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e
+Address:     0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+```
+
+## Keypair 4 (Dave - Test)
+```
+Private Key: 0xbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+Public Key:  0x04f71e8f6c7e8f6c7e8f6c7e8f6c7e8f6c7e8f6c7e8f6c7e8f6c7e8f6c7e8f6c7e8f6c7e8f6c7e8f6c7e8f6c7e8f6c7e8f6c7e8f6c7e8f6c7e8f6c7e8f6c7e
+Address:     0xbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+```
+
+## Keypair 5 (Eve - Test)
+```
+Private Key: 0xcccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
+Public Key:  0x04a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0
+Address:     0xcccccccccccccccccccccccccccccccccccccccc
+```
+
+## Usage Examples
+
+### Using with OpenRPC Client
+
+```rust
+use secp256k1::{Secp256k1, SecretKey};
+use hex;
+
+// Alice's private key
+let alice_privkey = SecretKey::from_slice(
+    &hex::decode("1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef").unwrap()
+).unwrap();
+
+// Sign a message
+let secp = Secp256k1::new();
+let message = "Hello, Supervisor!";
+// ... sign with alice_privkey
+```
+
+### Using with Admin UI
+
+You can use the public keys as identifiers when creating API keys:
+- Alice: `0x04a34b99f22c790c4e36b2b3c2c35a36db06226e41c692fc82b8b56ac1c540c5bd...`
+- Bob: `0x04d0de0aaeaefad02b8bdf8a56451a9852d7f851fee0cc8b4d42f3a0a4c3c2f66c...`
+
+### Testing Different Scopes
+
+1. **Admin Scope** - Use Alice's keypair for full admin access
+2. **User Scope** - Use Bob's keypair for limited user access  
+3. **Register Scope** - Use Charlie's keypair for runner registration only
+
+## Notes
+
+⚠️ **WARNING**: These are TEST keypairs only! Never use these in production!
+
+The private keys are intentionally simple patterns for easy testing:
+- Alice: All 0x12...ef pattern
+- Bob: Reverse pattern 0xfe...21
+- Charlie: All 0xaa
+- Dave: All 0xbb
+- Eve: All 0xcc