fix(docker): add ffmpeg to viewer image for video thumbnails

[GeiserX]

Summary

• Adds ffmpeg to Dockerfile.viewer so video thumbnail generation works in the viewer container
• The backup container already had ffmpeg, but the viewer (which actually serves thumbnails) was missing it
• All video thumb requests were returning 404 because _check_ffmpeg() returned False

Test plan

• Verify viewer container has ffmpeg after rebuild
• Verify video thumbnails generate on first request
• Verify .MOV and .mp4 files show thumbnails in gallery

Summary by CodeRabbit

• New Features
  • Video thumbnail extraction capability is now available.
• Chores
  • Patch version update to 7.11.1.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 660d4380-574a-4d2c-b2b3-3c7588c5c65e

📥 Commits

Reviewing files that changed from the base of the PR and between 3180d1c and 1d7145a.

📒 Files selected for processing (3)

• Dockerfile.viewer
• pyproject.toml
• src/__init__.py

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📝 Walkthrough

Walkthrough

PR adds ffmpeg system tooling to the viewer Dockerfile for video thumbnail extraction, and bumps package version from 7.11.0 to 7.11.1 across project metadata and package exports.

Changes

Video Thumbnail Support & Patch Release

Layer / File(s)	Summary
ffmpeg system dependency for video thumbnails Dockerfile.viewer	Docker image now includes ffmpeg in the system package installation to support video thumbnail extraction alongside existing Pillow-based image processing.
Version synchronization pyproject.toml, src/__init__.py	Package version incremented from 7.11.0 to 7.11.1 across project metadata and package exports.

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the main change: adding ffmpeg to the viewer Docker image for video thumbnail support.
Description check	✅ Passed	The description provides a clear summary of the fix with context on why it was needed and a reasonable test plan, though it doesn't fully match the repository's template structure.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/viewer-ffmpeg

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.55%. Comparing base (3180d1c) to head (1d7145a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #172   +/-   ##
=======================================
  Coverage   92.55%   92.55%           
=======================================
  Files          23       23           
  Lines        6599     6599           
=======================================
  Hits         6108     6108           
  Misses        491      491           

Files with missing lines	Coverage Δ
src/__init__.py	100.00% <100.00%> (ø)

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[github-actions]

🐳 Dev images published!

• drumsergio/telegram-archive:dev
• drumsergio/telegram-archive-viewer:dev

The dev/test instance will pick up these changes automatically (Portainer GitOps).

To test locally:

docker pull drumsergio/telegram-archive:dev
docker pull drumsergio/telegram-archive-viewer:dev