feat: GET/DELETE /api/meters/:id with admin auth (#269)

[ladinoraa]

Summary

Closes AnnabelJoe#269

Adds the missing GET and DELETE endpoints for individual meter management, completing the meter device registration API.

Changes

• api/meters/[id]/route.ts
  • GET /api/meters/:id — retrieve meter info; returns 404 if not found
  • DELETE /api/meters/:id — soft-deactivate (sets active=false); historical readings remain intact
  • Both endpoints require operator JWT via requireAuth()
• api/v1/meters/[id]/route.ts — v1 re-export
• route.test.ts — 4 unit tests covering 200/404 for both operations

Acceptance criteria

• POST /api/meters to register a new meter with its public key (existing)
• GET /api/meters/:id to retrieve meter info
• DELETE /api/meters/:id to deactivate a meter
• Admin authentication required for all endpoints
• Public key stored and validated on registration (existing duplicate check)

[github-actions]

❌ pnpm audit

┌─────────────────────┬────────────────────────────────────────────────────────┐
│ critical            │ When Vitest UI server is listening, arbitrary file can │
│                     │ be read and executed                                   │
├─────────────────────┼────────────────────────────────────────────────────────┤
│ Package             │ vitest                                                 │
├─────────────────────┼────────────────────────────────────────────────────────┤
│ Vulnerable versions │ <4.1.0                                                 │
├─────────────────────┼────────────────────────────────────────────────────────┤
│ Patched versions    │ >=4.1.0                                                │
├─────────────────────┼────────────────────────────────────────────────────────┤
│ Paths               │ apps/web > @vitest/coverage-v8@2.1.9 > vitest@2.1.9    │
│                     │                                                        │
│                     │ apps/web > vitest@2.1.9                                │
│                     │                                                        │
│                     │ packages/stellar > vitest@2.1.9                        │
├─────────────────────┼────────────────────────────────────────────────────────┤
│ More info           │ https://github.com/advisories/GHSA-5xrq-8626-4rwp      │
└─────────────────────┴────────────────────────────────────────────────────────┘
5 vulnerabilities found
Severity: 4 moderate | 1 critical

[github-actions]

🔍 Vercel Preview Deployment

URL: Learn More: https://err.sh/vercel/missing-token-value

Uses Stellar testnet contract addresses.

[github-actions]

✅ cargo audit

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�[0m�[0m�[1m�[33mDate:     �[0m 2024-06-26
�[0m�[0m�[1m�[33mID:       �[0m RUSTSEC-2024-0388
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│       │   │   ├── multisig-admin 1.0.0
│       │   │   ├── energy-token 1.0.0
│       │   │   ├── community-governance 1.0.0
│       │   │   └── audit-registry 1.0.0
│       │   └── soroban-ledger-snapshot 23.5.3
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│       └── ark-bls12-381 0.4.0
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│   ├── soroban-env-host 23.0.1
│   ├── ark-poly 0.4.2
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�[0m�[0m�[1m�[33mCrate:    �[0m paste
�[0m�[0m�[1m�[33mVersion:  �[0m 1.0.15
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�[0m�[0m�[1m�[33mDate:     �[0m 2024-10-07
�[0m�[0m�[1m�[33mID:       �[0m RUSTSEC-2024-0436
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│       │   ├── soroban-sdk 23.5.3
│       │   │   ├── multisig-admin 1.0.0
│       │   │   ├── energy-token 1.0.0
│       │   │   ├── community-governance 1.0.0
│       │   │   └── audit-registry 1.0.0
│       │   └── soroban-ledger-snapshot 23.5.3
│       │       └── soroban-sdk 23.5.3
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│           ├── soroban-ledger-snapshot 23.5.3
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│           └── soroban-env-guest 23.0.1
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└── ark-ff 0.4.2
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    ├── ark-poly 0.4.2
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�[0m�[0m�[1m�[33mwarning:�[0m 2 allowed warnings found