feat: guide d'utilisation - couverture complete, telechargement MD/PDF, section Architecture Mermaid, guide desktop elargi (#105, BUG-067)

backend/openapi_docs.py

@@ -30,6 +30,7 @@ TAGS_METADATA: list[dict[str, str]] = [
     {"name": "Bookmarks", "description": "Recently opened files, bookmarks and saved searches."},
     {"name": "Backups", "description": "Automatic file backups, diffs, restore, compression and purge."},
     {"name": "Export", "description": "Export notes or whole vaults to HTML, Markdown bundle or ePub."},
+    {"name": "Guide", "description": "Download the in-app user guide as Markdown or PDF (mirrors the help modal, FR/EN)."},
     {"name": "AI", "description": "AI-powered editor actions, provider status and model discovery."},
     {"name": "BooksLM", "description": "Directory-scoped AI chat (NotebookLM-style) over a vault folder."},
     {"name": "MCP", "description": "Model Context Protocol server (Streamable HTTP) exposing the shared AI tool layer to external clients (Claude Desktop, Cursor…)."},
@@ -98,6 +99,7 @@ _TAG_RULES: list[tuple[re.Pattern[str], str]] = [
     (re.compile(r"^/api/backups"), "Backups"),
     (re.compile(r"^/api/file/[^/]+/(backups|diff|restore)"), "Backups"),
     (re.compile(r"^/api/export"), "Export"),
+    (re.compile(r"^/api/guide"), "Guide"),
     (re.compile(r"^/api/file/[^/]+/pdf"), "PDF"),
     (re.compile(r"^/api/search"), "Search"),
     (re.compile(r"^/api/tags"), "Search"),