chore: httpx retry transport + healthcheck stdlib + mypy config

- mcp_common/http.py: nuovo helper async_client() con
  AsyncHTTPTransport(retries=3) per gestire connection error transient
  + call_with_retry() generic async retry decorator. Sostituite 25
  occorrenze httpx.AsyncClient(...) in deribit/hyperliquid/sentiment/
  macro client. 5 nuovi test.

- Dockerfile healthcheck: passato da python+httpx subprocess a
  stdlib urllib.request.urlopen() su tutti i 6 servizi MCP. Zero
  dipendenze esterne nel runtime check, timeout esplicito 3s, image
  leggermente più snella.

- pyproject.toml: aggiunto [tool.mypy] python_version=3.13 con
  mypy_path multi-package + override ignore_missing_imports per i
  vendor SDK (pybit, alpaca, hyperliquid, pythonjsonlogger). mypy 1.20
  in dev deps; ruff pinned 0.5.x. mcp_common passa mypy clean; 44
  errori tipo pre-esistenti nei servizi affiorati ma non bloccanti —
  fix da pianificare separatamente.

- 455 test verdi.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

pyproject.toml

@@ -39,9 +39,42 @@ testpaths = ["services"]
 addopts = "--import-mode=importlib"
 consider_namespace_packages = true
 
+[tool.mypy]
+python_version = "3.13"
+strict = false
+warn_return_any = true
+warn_unused_ignores = true
+warn_redundant_casts = true
+check_untyped_defs = true
+ignore_missing_imports = true
+mypy_path = [
+    "services/common/src",
+    "services/mcp-alpaca/src",
+    "services/mcp-bybit/src",
+    "services/mcp-deribit/src",
+    "services/mcp-hyperliquid/src",
+    "services/mcp-macro/src",
+    "services/mcp-sentiment/src",
+]
+exclude = [
+    "^.*tests/.*$",
+    "^.venv/.*$",
+]
+
+[[tool.mypy.overrides]]
+module = [
+    "pybit.*",
+    "alpaca.*",
+    "hyperliquid.*",
+    "pythonjsonlogger.*",
+]
+ignore_missing_imports = true
+
 [dependency-groups]
 dev = [
     "pytest>=9.0.3",
     "pytest-asyncio>=1.3.0",
     "pytest-httpx>=0.36.2",
+    "mypy>=1.13",
+    "ruff>=0.5,<0.6",
 ]