feat(wiki,templates): v5.11.0 wiki-links & mentions + v5.12.0 templates & page lock (release 5.12.0)

v5.11.0 Wiki-links & mentions de page :
- tokens [[fdpage:ID]] / [[fddate:ISO]] dans le texte des blocs,
  service app/services/wiki_links.py (labels, rendu HTML, extraction)
- taper [[ ouvre le picker de pages (recherche floue, clavier) ;
  le menu @ gagne les sections Pages et Date (today/tomorrow/YYYY-MM-DD)
- chips atomiques contenteditable=false relues en tokens par gtTok()
  (autosave/drag/undo preservent les liens) ; renommage propage via
  GET /board/api/wiki/titles ; backlinks reconnaissent les tokens ;
  page publique rend les chips (echopee)

v5.12.0 Templates & verrouillage :
- template picker global sur + New page : 5 built-in
  (app/services/block_templates.py) + templates perso
  (table page_global_templates, migration 13)
- POST /board/api/page-templates (save current page) + /{id}/use
  (instantiate, id 0 = built-in par cle)
- page lock : POST /api/pages/{id}/lock, garde _ensure_page_editable
  -> 423 en ecriture pour les non-privileged, deblocage par
  locked_by ou admin seulement (403 sinon), banniere + read-only UI
- full-width / small text par page (pages.full_width/font_small,
  POST /api/pages/{id}/options, classes CSS)
- migration 13 : is_locked, locked_by, full_width, font_small,
  page_global_templates

Tests : tests/test_v511_v512_wiki_templates.py (15) ; suite complete
538 verte ; ruff OK ; node --check des templates JS OK.

app/migrations.py

@@ -509,3 +509,41 @@ def _migration_v58_meeting_template(conn: sqlite3.Connection) -> None:
         "UPDATE database_templates SET description=? WHERE name='Meeting notes'",
         ("Notes de réunion avec participants, agenda, notes et actions.",),
     )
+
+
+@register(13, "v5.11.0/v5.12.0: page lock, user typo prefs, global page templates")
+def _migration_v511_wiki_v512_templates(conn: sqlite3.Connection) -> None:
+    """v5.11.0 Wiki-links + v5.12.0 Templates & verrouillage.
+
+    ``pages.is_locked``              — read-only page (locker/admin can unlock).
+    ``pages.locked_by``              — user that locked the page.
+    ``pages.full_width``             — per-page full-width layout toggle.
+    ``pages.font_small``             — per-page compact typography toggle.
+    ``page_global_templates``        — user-created global page templates
+    (blocks_json = same format as the block editor saves).
+    """
+    _pcols = {r[1] for r in conn.execute("PRAGMA table_info(pages)").fetchall()}
+    if "is_locked" not in _pcols:
+        conn.execute("ALTER TABLE pages ADD COLUMN is_locked INTEGER NOT NULL DEFAULT 0")
+    if "locked_by" not in _pcols:
+        conn.execute("ALTER TABLE pages ADD COLUMN locked_by INTEGER REFERENCES users(id) ON DELETE SET NULL")
+    if "full_width" not in _pcols:
+        conn.execute("ALTER TABLE pages ADD COLUMN full_width INTEGER NOT NULL DEFAULT 0")
+    if "font_small" not in _pcols:
+        conn.execute("ALTER TABLE pages ADD COLUMN font_small INTEGER NOT NULL DEFAULT 0")
+
+    conn.execute(
+        """CREATE TABLE IF NOT EXISTS page_global_templates (
+               id INTEGER PRIMARY KEY AUTOINCREMENT,
+               name TEXT NOT NULL,
+               icon TEXT NOT NULL DEFAULT '📄',
+               description TEXT NOT NULL DEFAULT '',
+               blocks_json TEXT NOT NULL DEFAULT '[]',
+               created_by INTEGER REFERENCES users(id) ON DELETE SET NULL,
+               created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+               updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+           )"""
+    )
+    conn.execute(
+        "CREATE INDEX IF NOT EXISTS idx_pgt_creator ON page_global_templates(created_by)"
+    )