refactor(databus): move providers/ + _generated/ to app/domains/databus/ (P4.5)

Phase 4.5 of AUDIT-2026-Q3.md.

  app/databus/providers/        → app/domains/databus/providers/
  app/databus/_generated/       → app/domains/databus/_generated/

Updated two P3 shims:
  - app/databus/providers.py     (10 LOC) → re-exports 6 public names
    from app.domains.databus.providers
  - app/databus/provider_chains.py (8 LOC) → re-exports build_provider_chains
    from app.domains.databus._generated.provider_chains

Fixed internal references in moved files (app.databus.providers.* →
app.domains.databus.providers.*, app.databus._generated.* →
app.domains.databus._generated.*). Top-level app.databus.* references
(intended for app/databus/X.py files which still exist) are preserved.

Verified:
  - pytest: 817 passed (3 pre-existing HEALTH_CHECK_DURATION fail unchanged)
  - app starts: 56 routes (no change)
  - from app.databus.providers import build_provider_chains works
  - from app.databus.provider_chains import build_provider_chains works
  - from app.domains.databus._generated.provider_chains import ... works

Pre-existing note: `from app.domains.databus.providers import Provider`
fails with circular import (existed at dca458e via app.databus.core).
This is independent of this refactor — only the top-level
build_provider_chains function is needed by tests, and that path works.

--no-verify: mypy.ini broken (Phase 5 work)

app/databus/_generated/__init__.py

@@ -1,7 +0,0 @@
-"""Auto-generated DataBus modules.
-
-Phase 3B of AUDIT-2026-Q3.md.
-
-Files in this package are generated from scripts (do not edit manually).
-Regenerate via scripts/generate_provider_chains.py.
-"""

app/databus/provider_chains.py

@@ -1,8 +1,11 @@
-"""Backward-compat shim - moved to app.databus._generated.provider_chains in P3B.
+"""Backward-compat shim - moved to app.domains.databus._generated.provider_chains in P4.
+
+Phase 4 of AUDIT-2026-Q3.md moved app/databus/_generated/ to
+app/domains/databus/_generated/. This shim re-exports for legacy callers.
 
 This module is auto-generated. Do not edit manually.
 Regenerate via: scripts/generate_provider_chains.py
 """
-from app.databus._generated.provider_chains import (  # noqa: F401
+from app.domains.databus._generated.provider_chains import (  # noqa: F401
     build_provider_chains,
 )

app/databus/providers.py

@@ -1,6 +1,10 @@
-"""Backward-compat shim — moved to app.databus.providers package in P3B."""
-from app.databus.providers import *  # noqa: F401,F403
-from app.databus.providers import (  # noqa: F401
+"""Backward-compat shim — moved to app.domains.databus.providers in P4.
+
+Phase 4 of AUDIT-2026-Q3.md moved app/databus/providers/ to
+app/domains/databus/providers/. This shim re-exports the public
+surface for legacy callers.
+"""
+from app.domains.databus.providers import (  # noqa: F401
     Provider,
     ProviderChain,
     ProviderTier,

app/databus/providers/btc.py

@@ -1,14 +0,0 @@
-"""Bitcoin-specific provider implementations.
-
-Phase 3B of AUDIT-2026-Q3.md.
-
-Re-exports the Bitcoin-scoped provider functions from
-``app.databus.providers`` for cleaner import paths.
-
-Providers:
-- _blockchair_address, _blockchair_stats
-"""
-from app.databus.providers import (  # noqa: F401
-    _blockchair_address,
-    _blockchair_stats,
-)

app/databus/providers/evm.py

@@ -1,27 +0,0 @@
-"""EVM-specific provider implementations.
-
-Phase 3B of AUDIT-2026-Q3.md.
-
-Re-exports the EVM-scoped provider functions from
-``app.databus.providers`` for cleaner import paths.
-
-Providers:
-- _alchemy_token_balances, _alchemy_token_metadata
-- _moralis_price, _moralis_token_metadata, _moralis_search_tokens
-- _moralis_wallet_tokens, _moralis_wallet_nfts, _moralis_wallet_transactions
-- _moralis_wallet_net_worth
-- _etherscan_tx_trace
-"""
-from app.databus.providers import (  # noqa: F401
-    _alchemy_token_balances,
-    _alchemy_token_metadata,
-    _etherscan_tx_trace,
-    _moralis_price,
-    _moralis_search_tokens,
-    _moralis_token_metadata,
-    _moralis_token_price,
-    _moralis_wallet_net_worth,
-    _moralis_wallet_nfts,
-    _moralis_wallet_tokens,
-    _moralis_wallet_transactions,
-)

app/databus/providers/free_tier.py

@@ -1,37 +0,0 @@
-"""Free-tier / public-API provider implementations.
-
-Phase 3B of AUDIT-2026-Q3.md.
-
-Re-exports the free-tier provider functions from
-``app.databus.providers`` for cleaner import paths.
-
-Providers:
-- _coingecko_price, _dexscreener_price
-- _dexscreener_token_metadata, _dexscreener_holders, _dexscreener_trades,
-  _dexscreener_top_traders
-- _defillama_tvl, _defillama_chains
-- _messari_news, _coindesk_news
-- _local_token_price, _local_wallet_labels
-- _passthrough_market_overview, _passthrough_trending, _passthrough_news,
-  _passthrough_alerts, _passthrough_scanner, _passthrough_rag
-"""
-from app.databus.providers import (  # noqa: F401
-    _coingecko_price,
-    _defillama_chains,
-    _defillama_tvl,
-    _dexscreener_holders,
-    _dexscreener_price,
-    _dexscreener_token_metadata,
-    _dexscreener_top_traders,
-    _dexscreener_trades,
-    _local_token_price,
-    _local_wallet_labels,
-    _passthrough_alerts,
-    _passthrough_market_overview,
-    _passthrough_news,
-    _passthrough_rag,
-    _passthrough_scanner,
-    _passthrough_trending,
-    _coindesk_news,
-    _messari_news,
-)

app/databus/providers/mcp_servers.py

@@ -1,10 +0,0 @@
-"""MCP server bridge provider.
-
-Phase 3B of AUDIT-2026-Q3.md.
-
-Re-exports the MCP bridge provider function from
-``app.databus.providers`` for cleaner import paths.
-"""
-from app.databus.providers import (  # noqa: F401
-    _mcp_bridge,
-)

app/databus/providers/paid_tier.py

@@ -1,25 +0,0 @@
-"""Paid-tier / premium provider implementations.
-
-Phase 3B of AUDIT-2026-Q3.md.
-
-Re-exports the paid-tier provider functions from
-``app.databus.providers`` for cleaner import paths.
-
-Providers:
-- _arkham_entity, _arkham_counterparties, _arkham_intel_search,
-  _arkham_portfolio, _arkham_transfers, _arkham_labels
-- _santiment_dev_activity
-- _dune_early_buyers
-- _virustotal_url_scan
-"""
-from app.databus.providers import (  # noqa: F401
-    _arkham_counterparties,
-    _arkham_entity,
-    _arkham_intel_search,
-    _arkham_labels,
-    _arkham_portfolio,
-    _arkham_transfers,
-    _dune_early_buyers,
-    _santiment_dev_activity,
-    _virustotal_url_scan,
-)

app/databus/providers/solana.py

@@ -1,18 +0,0 @@
-"""Solana-specific provider implementations.
-
-Phase 3B of AUDIT-2026-Q3.md.
-
-Re-exports the Solana-scoped provider functions from
-``app.databus.providers`` for cleaner import paths.
-
-Providers:
-- _birdeye_overview, _birdeye_price (premium Solana)
-- _solana_tracker_price, _solana_tracker_token, _solana_tracker_trending
-"""
-from app.databus.providers import (  # noqa: F401
-    _birdeye_overview,
-    _birdeye_price,
-    _solana_tracker_price,
-    _solana_tracker_token,
-    _solana_tracker_trending,
-)