feat(phase-32): add AliasGraph import and singleton to api/main.py

Added imports for AliasGraph and EntityResolverV2 after api.models import.
Added module-level singletons _alias_graph = AliasGraph() and
_resolver_v2 = EntityResolverV2(threshold=0.82) so they are created once
and reused across all requests rather than per-request instantiation.

api/main.py

@@ -13,6 +13,8 @@ from loguru import logger
 from api.dependencies import get_driver, close_driver
 from api.routes import search, profile, graph, risk, multilingual, export, admin, investigation, affidavit, biography, benami, sources, procurement, conflict, linguistic, policy, adversarial, debate, runtime, resolve
 from api.models import HealthResponse, StatsResponse
+from processing.alias_graph import AliasGraph          # Phase 32
+from processing.entity_resolver_v2 import EntityResolverV2  # Phase 32
 from config.runtime_profile import PROFILE as _RUNTIME_PROFILE
 
 
@@ -134,6 +136,10 @@ _STATS_TTL        = 60.0
 import threading as _threading          # B-01 FIX: was missing entirely
 _stats_lock       = _threading.Lock()  # B-01 FIX: NameError on every GET /stats
 
+# Phase 32: shared AliasGraph instance (loaded once at startup)
+_alias_graph   = AliasGraph()
+_resolver_v2   = EntityResolverV2(threshold=0.82)
+
 
 @app.get("/stats", response_model=StatsResponse)
 def get_stats():