feat(phase-b): school/timetable API routers + graph nav tree

New routers (all previously untracked):
- graph_tree_router: /graph/tree, /graph/node/children, /graph/calendar/academic
  Supabase-driven tree builder; institute DB resolved by teacher email scan
- school_router: /school/status (role + calendar flags), /school/info PATCH
  Self-heals profiles.school_id from institute_memberships if null
- timetable_builder_router: /timetable/setup (AcademicYear/Term/Week + SchoolTimetable),
  /timetable/slots (read/write TimetableSlot nodes), /timetable/init (TeacherTimetable)
- user_init_router: /user/init (provision user node in institute DB)

routers.py: register all new routers with correct prefixes
users.py: add JournalNode and PlannerNode schema classes

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

modules/database/schemas/nodes/users.py

@@ -1,5 +1,13 @@
 from typing import ClassVar
-from .base_nodes import UserBaseNode
+from .base_nodes import UserBaseNode, CCBaseNode
 
 class UserNode(UserBaseNode):
     __primarylabel__: ClassVar[str] = 'User'
+
+class JournalNode(CCBaseNode):
+    __primarylabel__: ClassVar[str] = 'Journal'
+    user_id: str
+
+class PlannerNode(CCBaseNode):
+    __primarylabel__: ClassVar[str] = 'Planner'
+    user_id: str