feat: add v0.6 fee accounting

[MuncleUscles]

Adds Studio-side v0.6 user/transaction fee accounting, simulation/estimation report surfaces, frontend/explorer fee UI, and fee-focused tests. Validated locally with backend fee pytest suite, frontend fee unit tests, frontend build, explorer fee tests/lint/build.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5a2a0828-4016-4152-8dd0-3cd9d86f68c0

📥 Commits

Reviewing files that changed from the base of the PR and between c1705ab and 821b350.

⛔ Files ignored due to path filters (2)

• explorer/package-lock.json is excluded by !**/package-lock.json
• frontend/package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (63)

• .env.example
• .github/workflows/unit-tests-pr.yml
• .gitignore
• backend/consensus/base.py
• backend/consensus/worker.py
• backend/database_handler/accounts_manager.py
• backend/database_handler/transactions_processor.py
• backend/database_handler/validators_registry.py
• backend/domain/types.py
• backend/node/base.py
• backend/node/genvm/base.py
• backend/node/genvm/origin/base_host.py
• backend/node/genvm/origin/host_fns.py
• backend/node/types.py
• backend/protocol_rpc/endpoints.py
• backend/protocol_rpc/fastapi_endpoint_generator.py
• backend/protocol_rpc/fees.py
• backend/protocol_rpc/rpc_methods.py
• backend/protocol_rpc/transactions_parser.py
• backend/protocol_rpc/types.py
• docker-compose.yml
• docker/Dockerfile.backend
• docker/Dockerfile.consensus-worker
• docker/entrypoint-backend.sh
• docker/entrypoint-consensus-worker.sh
• explorer/eslint.config.mjs
• explorer/package.json
• explorer/scripts/test-fee-accounting.mjs
• explorer/src/app/address/[addr]/AddressContent.tsx
• explorer/src/app/address/[addr]/page.tsx
• explorer/src/app/contracts/page.tsx
• explorer/src/app/providers/page.tsx
• explorer/src/app/tx/[hash]/components/OverviewTab.tsx
• explorer/src/app/validators/page.tsx
• explorer/src/components/FeeAccountingPanel.tsx
• explorer/src/components/GlobalSearch.tsx
• explorer/src/lib/feeAccounting.ts
• explorer/src/lib/types.ts
• frontend/package.json
• frontend/src/components/Simulator/ContractMethodItem.vue
• frontend/src/components/Simulator/TransactionItem.vue
• frontend/src/hooks/useContractQueries.ts
• frontend/src/services/IJsonRpcService.ts
• frontend/src/services/JsonRpcService.ts
• frontend/src/types/events.ts
• frontend/src/types/responses.ts
• frontend/test/unit/components/ContractMethodItem.fees.behavioral.test.ts
• frontend/test/unit/components/TransactionItem.fees.behavioral.test.ts
• frontend/test/unit/hooks/useContractQueries.behavioral.test.ts
• frontend/test/unit/services/JsonRpcService.behavioral.test.ts
• sonar-project.properties
• tests/consensus/test_payable_scenarios.py
• tests/db-sqlalchemy/accounts_manager_test.py
• tests/db-sqlalchemy/validators_registry_test.py
• tests/unit/consensus/test_eth_send_emission.py
• tests/unit/consensus/test_payable_balance_flow.py
• tests/unit/test_contract_not_found_handling.py
• tests/unit/test_genvm_initial_time_units.py
• tests/unit/test_node_state_proxy_metrics.py
• tests/unit/test_rpc_genvm_admission.py
• tests/unit/test_run_genvm_host_state_copy.py
• tests/unit/test_studio_fees.py
• tests/unit/test_transactions_parser.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/v06-fees-studio

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[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
80.7% Coverage on New Code
2.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

🎉 This PR is included in version 0.121.0 🎉

The release is available on GitHub release

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