Store: fail loudly on untranslatable views; quoting hardening; true batched bulk KV

- database.view now raises SimplyBased::UnsupportedView when a declared view
  carries CouchDB-era options the N1QL translation silently ignored before:
  :conditions (a JS fragment) and :emit_value, plus CouchDB list functions.
  Silently dropping :conditions was the worst of these — a
  'view :completed, key: :name, conditions: ...' query returned *unfiltered*
  results with no hint anything was wrong. Covered by unsupported_view_spec.
- All column/property names interpolated into N1QL are now routed through
  quote_ident, which rejects backticks/backslashes. These names come from the
  model DSL rather than user input, but a smuggled backtick must never become
  query text. Class names in index predicates go through a proper string
  literal quoting helper for the same reason.
- ensure_index: failures are still swallowed (an index build in progress must
  not take down queries) but now emit a warning naming the index, because the
  silent version left every subsequent query on a primary-index scan with no
  trace. The ensured-indexes bookkeeping is mutex-guarded for multithreaded
  servers (Puma).
- bulk_load / bulk_destroy now actually batch (collection.get_multi /
  remove_multi — one KV round trip). The README already advertised
  'bulk (batched KV)' but the code looped one get/remove per id.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

lib/simply_based.rb

@@ -21,6 +21,10 @@ unless defined?(SimplyBased::VERSION)
     class NotImplementedError < RuntimeError; end
     class ModelNotInstantiatedError < RuntimeError; end
     class NotFound < RuntimeError; end
+    # Raised when a declared view carries options the N1QL translation cannot
+    # honour (e.g. :conditions / :emit_value / list functions). Failing loudly
+    # beats silently returning unfiltered results.
+    class UnsupportedView < Error; end
 
     # No-op retained for source compatibility with SimplyCouch. SimplyBased
     # never interpolates values into JavaScript views — queries are N1QL with