feat: v2.5.0 - disable_thinking, reasoning models, MIT license, security hardening

Features:
- disable_thinking toggle (issue #11) with per-provider semantics:
  OpenAI classic gets /no_think soft-switch, OpenAI reasoning gets
  reasoning_effort=low, DeepSeek gets both, Anthropic no-op (thinking
  opt-in), Gemini 2.5+ gets thinking_budget=0
- OpenAI reasoning model support (o1/o3/o4-mini/gpt-5 family):
  max_completion_tokens, developer role, reasoning_effort
- Per-request disable_thinking override in ask_question service
- Provider-specific temperature clip (Anthropic 0-1, others 0-2)

Security:
- Require API key re-entry on provider change (OptionsFlow)
- Validate Anthropic json_schema before system-prompt concatenation
- Symlink protection in history file operations
- Hardened secret redaction regexes (sk-*, AIza*, x-api-key)
- get_history service: hard cap on limit (default 10, max 100)

Reliability:
- Retry on 502/503/504 in addition to 429/timeout
- Honor Retry-After header on 429
- Exception chaining (raise ... from err)
- _strip_think_blocks handles nested/dangling tags
- normalize_name sha256 fallback for empty-collapse inputs

UI/housekeeping:
- api_key uses TextSelector(type=PASSWORD)
- DeviceInfo entry_type=SERVICE
- Services unregister on last entry unload
- Dependabot for GitHub Actions
- persist-credentials=false in checkout steps
- manifest requirements pinned with upper bounds
- Ignore docs/plans/ (working artifacts)

License: PolyForm Noncommercial 1.0.0 -> MIT

No breaking changes: service response shape, sensor attributes,
entity IDs and on-disk formats unchanged.

custom_components/ha_text_ai/const.py

@@ -1,7 +1,7 @@
 """
 Constants for the HA text AI integration.
 
-@license: PolyForm Noncommercial 1.0.0 (https://polyformproject.org/licenses/noncommercial/1.0.0)
+@license: MIT (https://opensource.org/licenses/MIT)
 @author: SMKRV
 @github: https://github.com/smkrv/ha-text-ai
 @source: https://github.com/smkrv/ha-text-ai
@@ -29,7 +29,7 @@ API_PROVIDERS: Final = [
     API_PROVIDER_GEMINI
 ]
 
-VERSION: Final = "2.4.1"
+VERSION: Final = "2.5.0"
 
 # Default endpoints
 DEFAULT_OPENAI_ENDPOINT: Final = "https://api.openai.com/v1"
@@ -50,6 +50,7 @@ CONF_CONTEXT_MESSAGES: Final = "context_messages"
 CONF_STRUCTURED_OUTPUT: Final = "structured_output"
 CONF_JSON_SCHEMA: Final = "json_schema"
 CONF_ALLOW_LOCAL_NETWORK: Final = "allow_local_network"
+CONF_DISABLE_THINKING: Final = "disable_thinking"
 
 ABSOLUTE_MAX_HISTORY_SIZE: Final = 200  # Hard cap; UI allows max MAX_HISTORY_SIZE (100)
 MAX_ATTRIBUTE_SIZE = 4 * 1024
@@ -69,6 +70,7 @@ DEFAULT_NAME_PREFIX = "ha_text_ai"
 DEFAULT_INSTANCE_NAME: Final = "my_assistant"
 DEFAULT_CONTEXT_MESSAGES: Final = 5
 DEFAULT_ALLOW_LOCAL_NETWORK: Final = False
+DEFAULT_DISABLE_THINKING: Final = False
 MIN_CONTEXT_MESSAGES: Final = 1
 MAX_CONTEXT_MESSAGES: Final = 20
 MIN_HISTORY_SIZE: Final = 1