test: add gateway auth middleware unit tests

[dev-khimesh]

Summary

Add comprehensive unit tests for the gateway auth middleware and fix pre-existing compilation issues blocking tests.

Changes

Bug Fixes

• Removed duplicate functions: getClientIP, writeJSON, generateUUID, generateAPIKey from middleware.go (already defined in api.go, same package)
• Removed unused imports: fmt from middleware.go, errors and sort from api.go
• Fixed function name mismatch: generateUUID() → generateRequestID() to match api.go

Tests Added (12 total, all pass)

AuthMiddleware tests:

• Missing bearer token → 401 with unauthorized error
• Invalid token (stub accepts any token) → 200
• Valid token sets user_id, session_id, auth_method in response
• Does not call handler when unauthorized

RateLimitMiddleware tests:

• First request allowed, rate limit headers set
• Exhaust budget (burst=3) → 429 with rate_limit_exceeded

Middleware ordering tests:

• Auth before RateLimit: missing token blocked before reaching rate limiter
• Authenticated request passes both auth + rate limit

Request context propagation:

• Full middleware chain propagates user/session/auth context
• RequestIDMiddleware sets X-Request-ID header

RecoveryMiddleware:

• Catches panics → 500 with internal_server_error
• Allows normal requests through

Test Results

go test ./gateway/ -v  # 12/12 pass

Closes #2

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d15d2e75-40d4-4ae2-8f7f-f27e29ca7d04

📥 Commits

Reviewing files that changed from the base of the PR and between 1462fe7 and e1de94d.

⛔ Files ignored due to path filters (2)

• tools/encryptly/windows-arm64/encryptly.exe is excluded by !**/*.exe
• tools/encryptly/windows-x64/encryptly.exe is excluded by !**/*.exe

📒 Files selected for processing (11)

• build.py
• frontend/src/services/api.ts
• market/gateway/api.go
• market/gateway/middleware.go
• market/gateway/middleware_test.go
• tests/__init__.py
• tests/test_diagnostic_metadata.py
• tools/encryptly/linux-arm64/encryptly
• tools/encryptly/linux-x64/encryptly
• tools/encryptly/macos-arm64/encryptly
• tools/encryptly/macos-x64/encryptly

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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