feat: replace text boxes with nested toggle UI for tool config

Replace the flat comma-separated disabled_tools/pinned_tools text boxes
with a Grocy-style nested object schema that renders as collapsible
sections with toggles in the HA Supervisor UI.

- enabled_tools: 23 collapsible groups, each with a group-level
  "enabled" master toggle and individual tool toggles (ON=enabled)
- pinned_tools: same group structure for pinning tools in search mode,
  with currently-pinned tools defaulting to ON
- Restore enable_yaml_config_editing as a standalone bool toggle
- start.py flattens the nested config into comma-separated env vars
  (DISABLED_TOOLS, PINNED_TOOLS) for the server
- server.py _apply_tool_visibility respects both the flat list and
  the enable_yaml_config_editing toggle
- Mandatory tools (ha_search_entities, ha_get_state, ha_get_overview,
  ha_report_issue) are re-enabled regardless of user config
- Full translations with friendly names and descriptions for all 92 tools
- Uses 3-level nesting (supported since Supervisor 2025.09.1)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: kingpanther13

.env.example

@@ -28,11 +28,17 @@ LOG_LEVEL=INFO
 # Recommended for models without deferred tool support or with limited context.
 # ENABLE_TOOL_SEARCH=false
 
+# Managed YAML config editing: allows ha_config_set_yaml to add/replace/remove
+# top-level keys in configuration.yaml and packages/*.yaml.
+# ENABLE_YAML_CONFIG_EDITING=false
+
 # Disable specific tools or tool groups (comma-separated).
 # Group names: HACS, System, Automations, etc. Tool names: ha_config_set_yaml, etc.
+# In the add-on, this is populated automatically from the enabled_tools UI.
 # DISABLED_TOOLS=ha_config_set_yaml
 
 # Additional tools to pin when tool search is enabled (comma-separated).
+# In the add-on, this is populated automatically from the pinned_tools UI.
 # PINNED_TOOLS=
 
 # Max results from ha_search_tools (2-10, default 5).