Prepare internal extension distribution

docs/internal-extension-distribution.md

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+# Internal Extension Distribution
+
+## Fixed Extension ID
+
+- Manifest key is fixed in the project.
+- The unpacked extension ID is `pkjopdibdnomhogjheclhnknmejccffg`.
+- Update Logto with:
+  - `https://pkjopdibdnomhogjheclhnknmejccffg.chromiumapp.org/callback`
+  - `https://pkjopdibdnomhogjheclhnknmejccffg.chromiumapp.org/`
+  - `chrome-extension://pkjopdibdnomhogjheclhnknmejccffg`
+
+## Internal Package
+
+1. Run `npm test`.
+2. Run `npm run package:internal`.
+3. Send `release/star-chart-search-enhancer-internal.zip` to coworkers.
+
+## Coworker Install Steps
+
+1. Unzip `star-chart-search-enhancer-internal.zip`.
+2. Open `chrome://extensions`.
+3. Enable developer mode.
+4. Click `Load unpacked`.
+5. Select the unzipped folder.
+6. Confirm the extension ID is `pkjopdibdnomhogjheclhnknmejccffg`.
+
+## Notes
+
+- Keep `.local/extension-key.pem` private and backed up internally.
+- Do not commit or share the private key with people who only need to install the extension.
+- If the batch submit backend changes away from `192.168.31.21:8083`, update `scripts/manifest.mjs` before packaging.