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feat(user): implement update_profile flow (UC3)

Closes #13.

Adds the `update_profile(UpdateProfileArgs)` method on the User Canister
that allows the owner to partially update their profile (display name,
bio) and propagates the change to followers via an `Update(Person)`
ActivityPub activity through the Federation Canister.

User Canister
- `did::user::UpdateProfileArgs { display_name, bio }` using
  `FieldUpdate<T>` (`Leave` / `Clear` / `Set`); `UpdateProfileResponse`
  and `UpdateProfileError { Internal }`.
- `api::update_profile` + `lib.rs` + `inspect_message` enforce owner-only
  access.
- `ProfileRepository::update_profile` returns `CanisterResult<bool>`:
  `true` when a row was written, `false` when all fields are `Leave`.
  Advances `updated_at` on every mutation.
- `domain::profile::update_profile` reloads the profile, builds an
  `Update(Person)` activity (actor URI, Mastodon-style `name`/`summary`,
  RFC 3339 `updated`, inbox/outbox/followers URIs), addresses
  `to=[AS_PUBLIC], cc=[followers_url]`, fans out one activity per
  follower minus blocked actors, and dispatches via the Federation
  adapter as `SendActivityArgs::Batch`.
- New `domain::block::BlockRepository::list_blocked_uris` read path
  over the existing `blocks` table (full `block_user` RPC stays WI-1.10).
- `handle_incoming`: unknown activity types are silently accepted
  (logged) instead of returning `ProcessingFailed`. ActivityPub receivers
  should absorb verbs they do not implement so the sender does not treat
  the delivery as a federation failure; this unblocks fanout to
  followers who will not apply `Update(Person)` until M3.

Shared utilities
- `FieldUpdate<T>` stays in `did::common` (pure API type). Its
  database-facing conversion `field_update_to_nullable` moves to the
  `db-utils` crate so every repository doing partial updates can reuse
  it.
- `ic_utils::rfc3339` + private `civil_from_unix` render millisecond
  Unix timestamps into RFC 3339 UTC strings, reusable... (continued)

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