[Backend] backend/.env.example is missing several env vars referenced in backend/src/config and lib, making first-time setup error-prone

[grantfox-oss]

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Why this matters

backend/.env.example is the canonical reference new contributors copy to .env. If variables consumed in backend/src/config/, backend/src/lib/pg-pool.ts, backend/src/lib/redis.ts, or backend/src/services/sorobanService.ts (e.g. pool size, Redis URL, RPC URL) aren't all listed there, first-time setup fails with unclear "undefined is not a valid config" errors instead of a clear missing-env message.

Acceptance criteria

• Grep backend/src for all process.env.* reads
• Cross-check every one appears in backend/.env.example with a sensible placeholder/default and comment
• Add any missing entries

Files to touch

• backend/.env.example

Out of scope

• Adding runtime env validation (e.g. zod schema) — that's a separate feature
• Changing default values used in code

[Oyinkans0la12]

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[Seunfunmi-319509]

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[JemimahEkong]

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[Nife-tanny]

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[Ajibose]

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[pixels26]

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[OTimileyin]

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[Oyintarede]

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