build(server): count the bare datetime name the query builder takes

The datetime rule only matched a literal holding a call such as
datetime('now'). The query builder spells the same function as
eb.fn('datetime', [...]), where the literal is just the name, so that form
slipped through while strftime, json_extract and glob are caught bare. A
literal that is exactly datetime, julianday or unixepoch now counts as well,
the same way the glob rule treats a bare glob. The only such call lives in the
dialect layer, which is not scanned, so the baseline does not change.

server/scripts/dialect-lint.mjs

@@ -58,7 +58,9 @@ export const RULES = [
   },
   {
     name: 'datetime',
-    test: (text) => /\b(datetime|julianday|unixepoch)\s*\(/i.test(text),
+    // The call in SQL text, or the bare name the query builder takes in eb.fn('datetime', [...]).
+    test: (text) =>
+      /\b(datetime|julianday|unixepoch)\s*\(/i.test(text) || /^(datetime|julianday|unixepoch)$/i.test(text.trim()),
     advice: 'use currentTimestamp/nowMinusDays/nowPlusSeconds and friends from sql-functions.ts',
     migrations: true,
   },