Fix ai-service Dockerfile: bake in drug_entities.json, override its path

apps/ai-service/migrations/002_rag_conversation_turn.sql

@@ -0,0 +1,13 @@
+-- F-08 durable conversation history: replaces RagAgent's in-process dict
+-- (lost on restart, not shared across workers). Append-only; `id`'s
+-- insertion order is the "oldest -> newest" ordering the understanding LLM
+-- prompt already expects, no separate turn-index column needed.
+CREATE TABLE IF NOT EXISTS rag_conversation_turn (
+    id bigserial PRIMARY KEY,
+    conversation_id text NOT NULL,
+    line text NOT NULL,
+    created_at timestamptz NOT NULL DEFAULT now()
+);
+
+CREATE INDEX IF NOT EXISTS rag_conversation_turn_conv_idx
+    ON rag_conversation_turn (conversation_id, id);