feat: add archiving of platform media files (#1)

* chore: specify non-ignored `.md` files

* refactor: rename youtube downloader to ytdlp

More generic name since yt-dlp supports many sites beyond YouTube.

* feat: add local file downloader

Supports file:// URLs for archiving local files.

* deps: add regex crate for URL pattern matching

* feat: expand source detection with granular YouTube types

- Split Source::YouTube into YouTubeVideo, YouTubePlaylist, YouTubeChannel
- Add Source::X for Twitter/X posts
- Add Source::Local for file:// URLs
- Add regex-based URL pattern matching for YouTube URLs
- Add shorthand schemes (yt:video/ID, youtube:playlist/ID, etc.)
- Add comprehensive tests for all URL patterns

* docs: update README milestones

Mark YouTube videos, Twitter videos, and local files as done.

* chore: update flake.lock

* feat: add shorthand schemes for X/Twitter media

* chore: move docs into docs dir

* Remove temp file using timestamp path

Delete the temp entry at store_path/temp/<timestamp> in both
the hash-exists and success paths. Stop constructing the full filename
with extension and remove the early process::exit to de-duplicate
cleanup.

* Add Nix caches and default flake package

* Add social platform source detection and update milestones

* Tighten social URL matching to avoid false positives

* Mark media archiving milestone complete

docs/LICENSE.md

@@ -0,0 +1,21 @@
+# MIT License
+
+Copyright (c) 2025-present thegeneralist01
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

docs/README.md

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+# archivr
+
+An open-source self-hosted archiving tool. Work in progress.
+
+## Milestones
+- [ ] Archiving
+    - [X] Archiving media files from social media platforms
+        - [X] YouTube Videos
+        - [X] Twitter Videos
+        - [X] Instagram
+        - [X] Facebook
+        - [X] TikTok
+        - [X] Reddit
+        - [X] Snapchat
+        - [ ] YouTube Posts (postponed)
+    - [X] Archiving local files
+    - [ ] Archiving files from cloud storage services (Google Drive, Dropbox, OneDrive) and from URLs
+        - [ ] URLs
+        - [ ] Google Drive
+        - [ ] Dropbox
+        - [ ] OneDrive
+        - (Some of these could be postponed for later.)
+    - [ ] Archiving Twitter threads
+    - [ ] Archive web pages (HTML, CSS, JS, images)
+    - [ ] Archiving emails (???)
+        - [ ] Gmail
+        - [ ] Outlook
+        - [ ] Yahoo Mail
+- [ ] Management
+    - [ ] Deduplication
+    - [ ] Tagging system
+    - [ ] Search functionality
+    - [ ] Categorization
+    - [ ] Metadata extraction and storage
+- [ ] User Interface
+    - [ ] Web-based UI
+- [ ] Backup and Sync
+    - [ ] Cloud backup (AWS S3, Google Cloud Storage)
+    - [ ] Local backup
+
+## Motivation
+There are two driving factors behind this project:
+- In the age of information, all data is ephemeral. Social media platforms frequently delete content, and cloud storage services can become inaccessible and unreliable. Being able to archive important data is *very important* for preserving personal memories and digital history.
+- I will be creating a small encyclopedia for my future family and kids. Therefore, I want to make sure that all the information I gather is preserved and accessible for future reference.
+
+This project aims to provide a reliable solution for archiving important data from various sources, ensuring that users can preserve their digital assets for the long term.
+
+## License
+This project is licensed under the MIT License. See the [LICENSE](LICENSE.md) file for details.