Remove CalDAV/DAV support

[dkhalife]

Now that we have an Android app that can integrate with calendars directly, CalDAV support is no longer needed.

Changes

Phase 1: Delete CalDAV source files

• Deleted apiserver/internal/apis/caldav.go (HTTP handler: routes, PROPFIND, REPORT, GET, PUT, HEAD, OAuth discovery)
• Deleted apiserver/internal/models/caldav.go (WebDAV/CalDAV XML struct models)
• Deleted apiserver/internal/repos/caldav/ (CalDavRepository, VTODO generation, tests)
• Deleted apiserver/internal/utils/caldav/ (VTODO parser, XML builder, tests)

Phase 2: Remove CalDAV references from shared code

• apiserver/main.go — Removed caldav repo import, DI registrations, and route invoke
• apiserver/internal/models/user.go — Removed Dav.Read and Dav.Write token scopes
• apiserver/internal/middleware/auth/auth.go — Removed /dav WWW-Authenticate header and wwwAuthenticateHeader() method

Phase 3: Update documentation

• Deleted .agents/features/caldav.md
• Updated .agents/architecture.md — removed CalDAV mentions
• Updated .agents/features/api-tokens.md — removed Dav scopes from permissions list

Notes

• No database migration needed (CalDAV had no tables/columns)
• No frontend, MCP server, or Android changes (CalDAV was backend-only)
• No go.mod dependency changes (CalDAV used only stdlib)

[Copilot]

Pull request overview

Removes the backend CalDAV/WebDAV integration now that calendar integration is expected to happen via the Android app, and cleans up related scope/docs references.

Changes:

• Deleted CalDAV HTTP handlers, XML models, repository, and utility code (plus associated tests).
• Removed CalDAV DI wiring/routes and removed Dav-related API token scopes.
• Updated internal architecture/docs to remove CalDAV mentions.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
apiserver/main.go	Removes CalDAV repository/API DI registrations and route invocation.
apiserver/internal/apis/caldav.go	Deleted CalDAV endpoints/routes (PROPFIND/REPORT/GET/PUT/HEAD + discovery).
apiserver/internal/models/caldav.go	Deleted WebDAV/CalDAV XML response/request struct models and namespaces.
apiserver/internal/repos/caldav/caldav.go	Deleted CalDAV repository implementation (ETag/VTODO generation, multiget, updates).
apiserver/internal/repos/caldav/caldav_test.go	Deleted tests for VTODO generation behavior.
apiserver/internal/utils/caldav/parser.go	Deleted VTODO parsing utility.
apiserver/internal/utils/caldav/parser_test.go	Deleted tests for VTODO parsing utility.
apiserver/internal/utils/caldav/xml.go	Deleted XML response builder utility.
apiserver/internal/models/user.go	Removes Dav.Read/Dav.Write scopes from the scope enum/list.
apiserver/internal/middleware/auth/auth.go	Removes CalDAV-specific WWW-Authenticate behavior and helper method.
.agents/features/caldav.md	Deleted CalDAV feature documentation.
.agents/features/api-tokens.md	Removes Dav scopes from documented permissions list.
.agents/architecture.md	Removes CalDAV mentions from architecture summary.

[Copilot]

The scope examples here use task:read / label:write, but the actual scope strings in code are Tasks.Read, Labels.Write, etc. Updating the examples to match the real scope format would prevent confusion for API token users and keep documentation consistent with apiserver/internal/models/user.go.

Suggested change

	- **Scope-based authorization** on API tokens (e.g. `task:read`, `label:write`)
	- **Scope-based authorization** on API tokens (e.g. `Tasks.Read`, `Labels.Write`)

[Copilot]

This permissions list includes Tokens.Write, but there is no corresponding scope constant or usage in the codebase (only Tasks/Labels/User scopes exist in apiserver/internal/models/user.go). Either remove Tokens.Write from the docs or add the missing scope/support so the documentation matches the implementation.

Suggested change

	- Scoped permissions: Tasks.Read, Tasks.Write, Labels.Read, Labels.Write, User.Read, User.Write, Tokens.Write
	- Scoped permissions: Tasks.Read, Tasks.Write, Labels.Read, Labels.Write, User.Read, User.Write

[codecov]

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