feat(meal-planner): add get_meal_plan read-only tool (v0.10.0)

- Implement get_meal_plan() tool for accessing Family Wall meal planner
- Parameters: date_from, date_to (ISO 8601 format)
- Returns raw JSON for initial verification via FW_DEBUG=1
- Response structure to be verified in first deployment
- Add Meal Planner API section to SPEC.md documenting mplistinterval and other endpoints
- Update version to 0.10.0 in __init__.py and pyproject.toml
- Update README.md and CLAUDE.md with tool info and roadmap

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

README.md

@@ -2,7 +2,7 @@
 
 MCP server for [Family Wall](https://www.familywall.com) -- read and manage your family's circles, lists, tasks, and recipes directly from Claude.
 
-## Features (v0.9.1)
+## Features (v0.10.0)
 
 ### Read
 
@@ -15,6 +15,7 @@ MCP server for [Family Wall](https://www.familywall.com) -- read and manage your
 - `get_recipes` -- list all family recipes (compact summary: id, name, prep/cook time, serves)
 - `get_recipe` -- get a single recipe in full detail (ingredients, instructions, ingredients_parsed, category_ids, etc.)
 - `get_recipe_categories` -- list all available recipe categories (always returns all 5 standard categories: Bei Kindern beliebt, Wirklich einfach, Nachspeisen, Schmeckt toll, Gemüse; plus any additional categories found in existing recipes)
+- `get_meal_plan` -- get meal plan entries for a date range (Premium feature; returns raw JSON for verification)
 
 ### Write (with confirmation prompt)