Fix: resolve environment parity, router lazy loading, API types, and test teardown

[dorismaduegbunam]

PR Description

Closes #573
Closes #575
Closes #576
Closes #574

Summary of Changes

Issue #573 — Config Parity & Direct process.env Removal

• Updated backend/src/config/index.ts Zod envSchema to validate all missing environment variables (RATE_LIMIT_PUBLIC_*, RATE_LIMIT_AUTHED_*, RATE_LIMIT_ADMIN_*, VENICE_MODEL_VERSION, VENICE_CACHE_*, VENICE_REQUEST_TIMEOUT_MS, VENICE_PROVIDER_MAX_RETRIES, VENICE_FALLBACK_*, QUALITY_*, AI_NET_READ_ONLY*, ADMIN_*, FEATURE_*).
• Updated backend/.env.example to achieve 100% two-way key parity with envSchema. Removed duplicate keys (DATABASE_URL, DAILY_TASK_LIMIT_PER_WALLET), removed legacy PostgreSQL documentation references, and documented DB_POOL_* SQLite WAL read pool parameters.
• Refactored direct process.env reads across feature modules (agents.ts, auth.ts, errorHandler.ts, rateLimit.ts, tasks.ts, v1/tasks.ts, v2/tasks.ts, versions.ts, cache/registry.ts, db/index.ts, loader.ts, schemas/task.ts, adminControl.ts, tokenService.ts, featureFlags.ts, idempotency.ts, qualityScorer.ts, venice/client.ts) to use getConfig().
• Added automated two-way parity test in backend/tests/config.test.ts and process env assertion guard in backend/tests/no-direct-process-env.test.ts.

Issue #575 — Frontend Route Imports & Suspense Fallback

• Updated lazy component imports in frontend/src/App.tsx (./pages/dashboard, ./pages/WalletPage, ./pages/AgentsPage, ./pages/tasks/NewTaskPage, ./pages/tasks/TaskHistoryPage, ./pages/TaskDetailPage, ./pages/RendererDemoPage) to ensure default export compatibility.
• Wrapped routed components in <Suspense fallback={<RouteLoader />}>.
• Extended frontend/src/components/auth/ProtectedRoute.test.tsx to verify /tasks/history.

Issue #576 — TaskDetailPage Cleanup & API Type Consolidation

• Cleaned unused reactflow imports from frontend/src/pages/TaskDetailPage.tsx while preserving component rendering.
• Consolidated redundant types in frontend/src/types/api.ts (DAGNode/DagNode unified, CursorPage/CursorPageEnvelope consolidated).
• Added comprehensive unit test suite in frontend/src/pages/TaskDetailPage.test.tsx.

Issue #574 — Backend Coverage Exclusions & Teardown Cleanup

• Removed exclusions (!src/**/index.ts, !src/registry/sync.ts, !src/api/routes/stream.ts, !src/index.ts, !src/checkSpec.ts) from backend/jest.config.js.
• Removed duplicate orphan file backend/tests/globalTeardown.ts, retaining backend/tests/global-teardown.ts.

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[devJaja]

@dorismaduegbunam

Kindly resolve the conflicts