feat: scaffold newsfeed — user-controlled news feed

A self-hosted feed where the user owns the ranking: per-source and signed
per-interest weights, decayed by recency, via a transparent deterministic
scorer. Content is sourced algorithmically (worker RSS/Atom polling) and
agentically (per-user API tokens POSTing candidates to the ingest endpoint).
Single-user today, multi-user by construction (every row keyed on user_id).

Rust cargo workspace + Vite/React/SWC/TS SPA:
- newsfeed-entities: DTOs (ts-rs bindings -> web/src/api/bindings)
- newsfeed-core: ranking, auth primitives, ingest, data-access ports
- newsfeed-data: SQLite adapters (sqlx, runtime queries)
- newsfeed-api: axum REST/JSON daemon
- newsfeed-worker: RSS polling + rescoring loop
- web: responsive, mobile-first SPA (React Query, generated types)

Deploy (Gitea Actions, build static musl + SPA, rsync as gitea_ci):
api+worker -> slartibartfast, SPA -> oolon (nginx serves + proxies /v1).

Deliberate deviations from house conventions (documented in CLAUDE.md/readme):
- SQLite instead of Postgres; api+worker co-locate sharing one DB file.
- Runtime sqlx queries instead of query! macros (SQLite dynamic typing;
  keeps CI database-free).

Verified end-to-end: auth, token ingest, interest-weighted ranking, signals,
pagination (curl + browser); cargo fmt/clippy -D/test and pnpm build/lint pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016fKZzDpvjiJ9eYbPGgJvUP

crates/newsfeed-data/migrations/0001_init.sql

@@ -0,0 +1,92 @@
+-- newsfeed initial schema (SQLite).
+--
+-- Conventions for this datastore:
+--   * ids            TEXT  — hyphenated UUIDv4
+--   * timestamps     TEXT  — RFC3339 / ISO8601 (UTC)
+--   * booleans       INTEGER — 0/1
+--   * json blobs     TEXT  — serde_json arrays/objects
+--
+-- Every user-owned row carries user_id and cascades on user deletion, because each
+-- user is wholly in control of — and isolated within — their own feed.
+
+CREATE TABLE users (
+    id            TEXT PRIMARY KEY,
+    username      TEXT NOT NULL UNIQUE,
+    email         TEXT NOT NULL UNIQUE,
+    password_hash TEXT NOT NULL,
+    created_at    TEXT NOT NULL
+);
+
+CREATE TABLE sessions (
+    id         TEXT PRIMARY KEY,
+    user_id    TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    token_hash TEXT NOT NULL UNIQUE,
+    created_at TEXT NOT NULL,
+    expires_at TEXT NOT NULL
+);
+CREATE INDEX idx_sessions_user ON sessions(user_id);
+
+CREATE TABLE api_tokens (
+    id           TEXT PRIMARY KEY,
+    user_id      TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    name         TEXT NOT NULL,
+    prefix       TEXT NOT NULL,
+    token_hash   TEXT NOT NULL UNIQUE,
+    created_at   TEXT NOT NULL,
+    last_used_at TEXT,
+    revoked_at   TEXT
+);
+CREATE INDEX idx_api_tokens_user ON api_tokens(user_id);
+
+CREATE TABLE sources (
+    id             TEXT PRIMARY KEY,
+    user_id        TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    kind           TEXT NOT NULL,               -- 'rss' | 'agentic'
+    name           TEXT NOT NULL,
+    url            TEXT,
+    weight         REAL NOT NULL DEFAULT 1.0,
+    enabled        INTEGER NOT NULL DEFAULT 1,
+    last_polled_at TEXT,
+    created_at     TEXT NOT NULL,
+    UNIQUE(user_id, name)
+);
+CREATE INDEX idx_sources_user ON sources(user_id);
+
+CREATE TABLE interests (
+    id         TEXT PRIMARY KEY,
+    user_id    TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    label      TEXT NOT NULL,
+    weight     REAL NOT NULL,
+    created_at TEXT NOT NULL,
+    UNIQUE(user_id, label)
+);
+CREATE INDEX idx_interests_user ON interests(user_id);
+
+CREATE TABLE items (
+    id           TEXT PRIMARY KEY,
+    user_id      TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    source_id    TEXT REFERENCES sources(id) ON DELETE SET NULL,
+    external_id  TEXT NOT NULL,
+    url          TEXT,
+    title        TEXT NOT NULL,
+    summary      TEXT,
+    author       TEXT,
+    tags         TEXT NOT NULL DEFAULT '[]',   -- json array of strings
+    media        TEXT NOT NULL DEFAULT '[]',   -- json array of Media
+    published_at TEXT,
+    ingested_at  TEXT NOT NULL,
+    state        TEXT NOT NULL DEFAULT 'candidate',
+    score        REAL NOT NULL DEFAULT 0.0,
+    UNIQUE(user_id, external_id)
+);
+-- Feed reads order by score within a user's live items.
+CREATE INDEX idx_items_feed ON items(user_id, state, score DESC, id DESC);
+
+CREATE TABLE signals (
+    id         TEXT PRIMARY KEY,
+    user_id    TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    item_id    TEXT NOT NULL REFERENCES items(id) ON DELETE CASCADE,
+    action     TEXT NOT NULL,                  -- 'view' | 'click' | 'save' | 'dismiss'
+    created_at TEXT NOT NULL
+);
+CREATE INDEX idx_signals_item ON signals(item_id);