Initial scaffold: CLAUDE.md, docs, and MCP config

- CLAUDE.md with project structure, DB access, and environment info
- docs/ with placeholder files for modular system, hooks/API, and builder fields
- .claude/settings.json with Playwright and Fetch MCP servers

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/builder-fields.md

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+# Builder Fields & Attributes
+
+## Field Types (`data-field-type`)
+
+The builder uses `data-field-type` attributes to define editable areas in module templates.
+
+<!-- TODO: Document available field types (text, image, richtext, link, repeater, etc.) -->
+
+
+## Conditional Attributes
+
+### `c-if`
+
+<!-- TODO: Document c-if syntax and usage for conditional rendering -->
+
+### `c-for`
+
+<!-- TODO: Document c-for syntax for repeating elements -->
+
+### `c-class`
+
+<!-- TODO: Document c-class for conditional CSS classes -->
+
+
+## Forms (`c-form`)
+
+<!-- TODO: Document c-form usage for builder-integrated forms -->
+
+
+## Builder Variables Access
+
+<!-- TODO: Document how to access and use builder variables in templates -->