Update documentation

- Update Backend-Development.md with recent changes
- Update Tasks.md with current status

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Docs/Tasks.md

@@ -1,22 +1,3 @@
-## 10) Startup sequence depends on implicit ordering
-- Where found:
-	- [backend/app/startup.py](backend/app/startup.py)
-- Why this is needed:
-	- Hidden order dependencies make lifecycle changes risky.
-- Goal:
-	- Explicitly define resource/task startup graph and required prerequisites.
-- What to do:
-	- Document dependency graph.
-	- Add startup assertions and health checks for each stage.
-- Possible traps and issues:
-	- Partial startup failures may leave stale scheduler or open sessions.
-- Docs changes needed:
-	- Add startup DAG and failure-mode behavior.
-- Doc references:
-	- [Docs/Architekture.md](Docs/Architekture.md)
-
----
-
 ## 11) Logging semantics are inconsistent across backend modules
 - Where found:
 	- [backend/app/services](backend/app/services)