Initial commit: The Daily EPUB full implementation

Full implementation of a personalized daily newspaper delivered as an
EPUB.

Articles are pulled from a local self-hosted Miniflux instance, enriched
with comments, summarized and filtered by DeepSeek AI, and then
assembled into two EPUB editions: standard and optimized for the Xteink
X4 e-ink reader. Both are served by the local self-hosted BookOrbit OPDS
server in a separate library. Then the X4 edition is futher converted to
XTC format and served over a separate OPDS server hosted by the Rust
binary. Runs are tracked in a local SQLite database so runs are
idempotent per date.

Full documentation of the plan is in docs/plans and setup and install
instructions are in the README.md file.

systemd/daily-epub-generate.timer

@@ -0,0 +1,22 @@
+# Fires daily-epub-generate.service every morning at 05:30 Eastern (spec §3.15).
+#
+# Install:
+#   sudo install -m0644 systemd/daily-epub-generate.timer /etc/systemd/system/
+#   sudo systemctl daemon-reload && sudo systemctl enable --now daily-epub-generate.timer
+# Check:  systemctl list-timers daily-epub-generate.timer
+
+[Unit]
+Description=Build The Daily EPUB every morning
+Documentation=https://github.com/thallada/the-daily-epub
+
+[Timer]
+Unit=daily-epub-generate.service
+OnCalendar=*-*-* 05:30:00 America/New_York
+# Catch up after downtime — a missed morning still gets its issue.
+Persistent=true
+# Spread the load on the Miniflux/DeepSeek side.
+RandomizedDelaySec=300
+AccuracySec=1min
+
+[Install]
+WantedBy=timers.target