move schema to sqlfile, create on init.

LNbits/data/schema.sql

@@ -0,0 +1,22 @@
+CREATE TABLE IF NOT EXISTS accounts (
+    userhash text PRIMARY KEY,
+    email text,
+    pass text
+);
+
+CREATE TABLE IF NOT EXISTS wallets (
+    hash text PRIMARY KEY,
+    name text NOT NULL,
+    user text NOT NULL,
+    adminkey text NOT NULL,
+    inkey text
+);
+
+CREATE TABLE IF NOT EXISTS apipayments (
+    payhash text PRIMARY KEY,
+    amount integer NOT NULL,
+    fee integer NOT NULL,
+    wallet text NOT NULL,
+    pending boolean NOT NULL,
+    memo text
+);