refactor(tokens): split 1418-LOC god-file into tokens package (P3B.7)

Move app/token_deployer.py verbatim to app/tokens/deployer.py with all 8
classes (TokenDeployment, DeployParams, ChainDeployer, EVMDeployer,
SolanaDeployer, TronDeployer, TokenDeployerFactory, DeploymentStorage)
and get_storage() preserved.

The legacy app/token_deployer.py becomes a 13-line re-export shim.
Public API fully preserved. Routes unchanged (56).

Phase 3B of AUDIT-2026-Q3.md.

app/tokens/__init__.py

@@ -0,0 +1,19 @@
+"""Tokens subsystem.
+
+Phase 3B of AUDIT-2026-Q3.md.
+
+Re-exports the canonical public API of the token deployer. Implementation
+lives in app.tokens.deployer (moved verbatim from app.token_deployer on
+2026-07-07).
+"""
+from app.tokens.deployer import (  # noqa: F401
+    ChainDeployer,
+    DeployParams,
+    DeploymentStorage,
+    EVMDeployer,
+    SolanaDeployer,
+    TokenDeployment,
+    TokenDeployerFactory,
+    TronDeployer,
+    get_storage,
+)