DOC: Update backend routes directory structure documentation

[Dotify71]

This PR updates the Routes table in docs/backend/backend_python/directory-structure.md to accurately reflect the current state of the backend/app/routes/ directory.

Changes

• Removed facetagging.py from the documentation, as the file no longer exists in the codebase.
• Added memories.py, detailing the endpoints for generating location and time-based photo memories.
• Added models.py, documenting the endpoints used for AI model management (download status, hardware recommendations, setup, and deletion).
• Added shutdown.py, covering the endpoint responsible for gracefully terminating the backend process.

(Note: test.py was intentionally omitted since its contents are currently commented out and it does not register an active router.)

This addresses the scoped documentation improvements confirmed in the issue discussion.

Closes #1257

Summary by CodeRabbit

• Documentation
  • Updated backend directory documentation to reflect the current set of route modules.
  • Added references to new route modules and revised descriptions for existing ones.
  • Removed an outdated route entry from the documented structure.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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• docs/backend/backend_python/directory-structure.md

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• docs/backend/backend_python/directory-structure.md

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Walkthrough

Updated the backend directory-structure documentation to reflect current route modules by adding new entries, removing an obsolete one, and revising several existing descriptions.

Changes

Routes documentation update

Layer / File(s)	Summary
Update routes table entries docs/backend/backend_python/directory-structure.md	Added rows for memories.py, models.py, and shutdown.py, revised descriptions for face_clusters.py and folders.py, and removed the facetagging.py row.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested labels: Documentation

Poem

A hop through docs, so tidy and neat,
New routes added, old ones deplete,
🐇 memories, models, shutdown too,
facetagging's gone, the table's anew,
Nibbling carrots as I approve this feat!

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the documentation update to the backend routes directory structure.
Linked Issues check	✅ Passed	The change matches issue #1257 by improving backend documentation structure and keeping the route list accurate.
Out of Scope Changes check	✅ Passed	The PR is documentation-only and stays within the requested backend route documentation update.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/backend/backend_python/directory-structure.md`:
- Around line 61-70: The routes table in the backend Python directory structure
doc needs reflowing to satisfy markdownlint MD060. Update the table under the
route files section so the pipe columns are consistently aligned across all
rows, especially the `Description` column entries. Keep the content unchanged
and adjust spacing in the table around the `albums.py`, `memories.py`, and
related rows to make the markdown lint clean.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

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Run ID: cdd1e657-68c9-4288-a62e-036e823aaf90

📥 Commits

Reviewing files that changed from the base of the PR and between ffc0d48 and 54698b7.

📒 Files selected for processing (1)

• docs/backend/backend_python/directory-structure.md