feat(talks): add official campus lectures

CHANGELOG.md

@@ -4,6 +4,12 @@ All notable changes to `sustech-cli` are documented in this file.
 
 ## [Unreleased]
 
+### Added
+
+- Added public `talks list` and `talks search` commands for official SUSTech
+  homepage lectures, showing upcoming events by default and all currently
+  displayed events with `--all`, with source metadata and text/JSON/JSONL output.
+
 ### Fixed
 
 - Made `auth status` use a metadata-only macOS Keychain lookup instead of

README.md

@@ -41,6 +41,7 @@ Public data does not require an account:
 sustech calendar day 2026-09-01
 sustech faculty search "computer vision"
 sustech online talks list --limit 10
+sustech talks list
 sustech online contact search "教学"
 sustech transit lines
 sustech library search "graph neural networks" --limit 5
@@ -166,6 +167,32 @@ Local state can also change through credential login/logout, persistent
 and do not overwrite an existing target unless the command explicitly permits
 and requests it.
 
+## Official campus lectures
+
+Official university lectures are available without login:
+
+```bash
+sustech talks list
+sustech talks list --all
+sustech talks list --json --pretty
+sustech talks search "物理" --jsonl
+sustech talks search "物理" --all
+```
+
+These commands read the lecture section of the official
+[homepage events page](https://www.sustech.edu.cn/zh/home-events.html), excluding
+notices. The default view shows lectures whose Beijing start time is still in
+the future, ordered from nearest to furthest. Records with an unparseable time
+remain visible under “time to confirm” rather than being silently omitted.
+`--all` adds lectures whose advertised start time has passed; it means all
+lectures currently displayed on the homepage, not the complete historical
+archive. Search matches titles, speakers, venues, and time text, and follows the
+same upcoming-by-default behavior. Results include title, speaker, venue,
+original time text, a normalized Beijing start time when parseable, timing
+classification, detail URL, reference time, and official source/fetch metadata.
+The existing `online talks` commands continue to use the community-maintained
+SUSTech Online source. The new official commands are CLI-only at present.
+
 ## Output contract
 
 ```bash