chore: add on-prem metadata source change tasks

Author: joonsoome

openspec/changes/add-onprem-metadata-source/proposal.md

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+# Change: On-prem metadata source configuration for Web Library
+
+## Why
+- Current setup keeps Zotero metadata on zotero.org while attachments live on WebDAV, creating ambiguity and dependence on cloud metadata.
+- We need a way to point the on-prem Web Library overlay to a self-hosted metadata source (Synology) or, if still using zotero.org, clearly configure API keys/endpoints.
+
+## What Changes
+- Investigate and document how the upstream Web Library config handles metadata endpoints/auth.
+- Add overlay configuration to select between zotero.org metadata and on-prem metadata service.
+- Provide env-based defaults and staging instructions for Synology-hosted metadata.
+
+## Impact
+- Affected code: Web Library overlay config and deployment env files.
+- Affected specs: add/update deployment/metadata capability to reflect on-prem metadata sourcing.

openspec/changes/add-onprem-metadata-source/tasks.md

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+## 1. Discovery
+- [ ] 1.1 Review upstream `zotero/web-library` config to identify metadata endpoint/auth settings (zotero.org defaults, API keys, user/group config).
+- [ ] 1.2 Check overlay code for existing overrides (e.g., pdf proxy base, userSlug/userId) and note gaps for metadata endpoint selection.
+
+## 2. On-prem metadata option
+- [ ] 2.1 Define how to point Web Library to an on-prem metadata backend (e.g., Zotero API proxy/self-hosted sync target on Synology) and document required env vars.
+- [ ] 2.2 Add overlay config/hooks to select metadata source via env (e.g., `METADATA_BASE_URL`, `ZOTERO_API_KEY`), including zotero.org fallback.
+- [ ] 2.3 Provide staging defaults (Synology) in env examples and Compose notes.
+
+## 3. Validation
+- [ ] 3.1 Manual check: Web Library loads collections/items from the chosen metadata source (on-prem vs zotero.org) while attachments remain WebDAV.
+- [ ] 3.2 Update docs/OpenSpec spec delta to capture the metadata-source selection requirement and scenarios.