feat: make openAICompatibleProvider work with Infomaniak out of the box (0.3.0)

- response_format is omitted by default (Infomaniak rejects the legacy
  json_object → HTTP 422); opt in via the new `responseFormat` option
  ({type:'json_object'} or a json_schema object). BREAKING for endpoints
  that relied on the forced json_object.
- parse LLM JSON leniently (tolerate markdown fences / surrounding prose)
- fold strict-coherence rules into DEFAULT_SYSTEM_PROMPT (exact
  placeholder<->mapping-key identity, values are originals, strict format,
  mask value not adjacent label) → reliable output across models

Verified live against Gemma 4 (google/gemma-4-31B-it, Infomaniak v2): all
demo phrases anonymize with clean round-trips, no custom provider needed.
36 tests passing.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@mobiletic/anonymizer",
-  "version": "0.2.0",
+  "version": "0.3.0",
   "description": "Framework-agnostic PII anonymization & pseudonymization: pluggable LLM detection for free-form PII (names, addresses) with a deterministic regex fallback, deterministic coreference, and streaming-safe de-anonymization.",
   "license": "MIT",
   "author": "Mobiletic",