fix: Remove target requirements from services to fix mandatory device/area/entity selection issue

- Removed target blocks from all services in services.yaml
- Services now work as global services without requiring device/area/entity selection
- Users can call services directly with only required parameters
- Fixes issue #2 where services incorrectly required target selection after v2.1.8 update

custom_components/ha_text_ai/services.yaml

@@ -4,10 +4,6 @@ ask_question:
     Send a question to the AI model and receive a detailed response.
     The response will be stored in the conversation history and can be retrieved later.
     This service now returns response data directly, eliminating the need to read from sensors.
-  target:
-    entity:
-      integration: ha_text_ai
-      domain: sensor
   fields:
     instance:
       name: Instance
@@ -82,10 +78,6 @@ clear_history:
   name: Clear History
   description: >-
     Delete all stored questions and responses from the conversation history
-  target:
-    entity:
-      integration: ha_text_ai
-      domain: sensor
   fields:
     instance:
       name: Instance
@@ -99,10 +91,6 @@ clear_history:
 get_history:
   name: Get History
   description: Retrieve conversation history with optional filtering and sorting
-  target:
-    entity:
-      integration: ha_text_ai
-      domain: sensor
   fields:
     instance:
       name: Instance
@@ -163,10 +151,6 @@ get_history:
 set_system_prompt:
   name: Set System Prompt
   description: Set default system behavior instructions for all future conversations
-  target:
-    entity:
-      integration: ha_text_ai
-      domain: sensor
   fields:
     instance:
       name: Instance