chore: rename quicproquo → quicprochat in Rust workspace

Rename all crate directories, package names, binary names, proto
package/module paths, ALPN strings, env var prefixes, config filenames,
mDNS service names, and plugin ABI symbols from quicproquo/qpq to
quicprochat/qpc.

crates/quicprochat-server/migrations/001_initial.sql

@@ -0,0 +1,47 @@
+CREATE TABLE IF NOT EXISTS key_packages (
+    id           INTEGER PRIMARY KEY AUTOINCREMENT,
+    identity_key BLOB NOT NULL,
+    package_data BLOB NOT NULL,
+    created_at   INTEGER DEFAULT (strftime('%s','now'))
+);
+
+CREATE TABLE IF NOT EXISTS deliveries (
+    id            INTEGER PRIMARY KEY AUTOINCREMENT,
+    recipient_key BLOB NOT NULL,
+    channel_id    BLOB NOT NULL DEFAULT X'',
+    payload       BLOB NOT NULL,
+    created_at    INTEGER DEFAULT (strftime('%s','now'))
+);
+
+CREATE TABLE IF NOT EXISTS hybrid_keys (
+    identity_key      BLOB PRIMARY KEY,
+    hybrid_public_key BLOB NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_kp_identity
+    ON key_packages(identity_key);
+
+CREATE INDEX IF NOT EXISTS idx_del_recipient_channel
+    ON deliveries(recipient_key, channel_id);
+
+CREATE TABLE IF NOT EXISTS server_setup (
+    id         INTEGER PRIMARY KEY CHECK (id = 1),
+    setup_data BLOB NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS users (
+    username      TEXT PRIMARY KEY,
+    opaque_record BLOB NOT NULL,
+    created_at    INTEGER DEFAULT (strftime('%s','now'))
+);
+
+CREATE TABLE IF NOT EXISTS user_identity_keys (
+    username     TEXT PRIMARY KEY,
+    identity_key BLOB NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS endpoints (
+    identity_key BLOB PRIMARY KEY,
+    node_addr    BLOB NOT NULL,
+    updated_at   INTEGER DEFAULT (strftime('%s','now'))
+);

crates/quicprochat-server/migrations/002_add_seq.sql

@@ -0,0 +1,21 @@
+-- Migration 002: add per-inbox delivery sequence numbers.
+--
+-- Adds a `seq` column to the deliveries table and a separate counter table
+-- that tracks the next sequence number per (recipient_key, channel_id) inbox.
+-- The counter is atomically incremented on each enqueue via an UPSERT so
+-- sequence numbers are gapless even under concurrent inserts.
+--
+-- Requires SQLite >= 3.35 (RETURNING clause support; available on Ubuntu 22.04+).
+
+ALTER TABLE deliveries ADD COLUMN seq INTEGER NOT NULL DEFAULT 0;
+
+CREATE TABLE IF NOT EXISTS delivery_seq_counters (
+    recipient_key BLOB    NOT NULL,
+    channel_id    BLOB    NOT NULL,
+    next_seq      INTEGER NOT NULL DEFAULT 0,
+    PRIMARY KEY (recipient_key, channel_id)
+);
+
+-- Index lets ORDER BY seq queries use an index scan instead of a sort.
+CREATE INDEX IF NOT EXISTS idx_del_seq
+    ON deliveries (recipient_key, channel_id, seq);

crates/quicprochat-server/migrations/003_channels.sql

@@ -0,0 +1,13 @@
+-- Migration 003: 1:1 DM channels.
+-- channel_id is 16 bytes (UUID); member_a and member_b are identity keys in sorted order.
+-- Unique on (member_a, member_b) prevents duplicate channels between the same pair.
+
+CREATE TABLE IF NOT EXISTS channels (
+    channel_id BLOB PRIMARY KEY,
+    member_a   BLOB NOT NULL,
+    member_b   BLOB NOT NULL,
+    UNIQUE(member_a, member_b)
+);
+
+CREATE INDEX IF NOT EXISTS idx_channels_members
+    ON channels(member_a, member_b);

crates/quicprochat-server/migrations/004_federation.sql

@@ -0,0 +1,16 @@
+-- 004_federation.sql: Federation support tables.
+
+-- Map identity keys to their home server domain.
+-- Used for routing: if a recipient's home_server != local domain, relay via federation.
+CREATE TABLE IF NOT EXISTS identity_home_servers (
+    identity_key BLOB PRIMARY KEY,
+    home_server  TEXT NOT NULL,
+    updated_at   INTEGER NOT NULL
+);
+
+-- Known federation peers (other quicnprotochat servers).
+CREATE TABLE IF NOT EXISTS federation_peers (
+    domain    TEXT PRIMARY KEY,
+    last_seen INTEGER NOT NULL,
+    is_active INTEGER NOT NULL DEFAULT 1
+);

crates/quicprochat-server/migrations/005_signing_key.sql

@@ -0,0 +1,4 @@
+CREATE TABLE IF NOT EXISTS server_signing_key (
+    id        INTEGER PRIMARY KEY CHECK (id = 1),
+    seed_data BLOB NOT NULL
+);

crates/quicprochat-server/migrations/006_kt_log.sql

@@ -0,0 +1,4 @@
+CREATE TABLE IF NOT EXISTS kt_log (
+    id       INTEGER PRIMARY KEY CHECK (id = 1),
+    log_data BLOB NOT NULL
+);

crates/quicprochat-server/migrations/007_add_expiry.sql

@@ -0,0 +1,2 @@
+ALTER TABLE deliveries ADD COLUMN expires_at INTEGER;
+CREATE INDEX idx_deliveries_expires ON deliveries(expires_at) WHERE expires_at IS NOT NULL;

crates/quicprochat-server/migrations/008_devices.sql

@@ -0,0 +1,8 @@
+CREATE TABLE IF NOT EXISTS devices (
+    identity_key BLOB NOT NULL,
+    device_id BLOB NOT NULL,
+    device_name TEXT NOT NULL DEFAULT '',
+    registered_at INTEGER NOT NULL DEFAULT (strftime('%s','now')),
+    PRIMARY KEY (identity_key, device_id)
+);
+CREATE INDEX IF NOT EXISTS idx_devices_identity ON devices(identity_key);

crates/quicprochat-server/migrations/009_sessions.sql

@@ -0,0 +1,8 @@
+CREATE TABLE IF NOT EXISTS sessions (
+    token BLOB PRIMARY KEY,
+    username TEXT NOT NULL,
+    identity_key BLOB NOT NULL,
+    created_at INTEGER NOT NULL,
+    expires_at INTEGER NOT NULL
+);
+CREATE INDEX IF NOT EXISTS idx_sessions_expires ON sessions(expires_at);

crates/quicprochat-server/migrations/010_blobs.sql

@@ -0,0 +1,15 @@
+CREATE TABLE IF NOT EXISTS blobs (
+    blob_id BLOB PRIMARY KEY,
+    data BLOB NOT NULL,
+    total_size INTEGER NOT NULL,
+    mime_type TEXT NOT NULL DEFAULT '',
+    uploaded_at INTEGER NOT NULL
+);
+CREATE TABLE IF NOT EXISTS blob_staging (
+    blob_hash BLOB NOT NULL,
+    offset INTEGER NOT NULL,
+    chunk BLOB NOT NULL,
+    total_size INTEGER NOT NULL,
+    mime_type TEXT NOT NULL DEFAULT '',
+    PRIMARY KEY (blob_hash, offset)
+);

crates/quicprochat-server/migrations/011_recovery_bundles.sql

@@ -0,0 +1,7 @@
+-- Recovery bundle storage: encrypted bundles keyed by token_hash.
+CREATE TABLE IF NOT EXISTS recovery_bundles (
+    token_hash BLOB PRIMARY KEY,
+    bundle     BLOB NOT NULL,
+    ttl_secs   INTEGER NOT NULL DEFAULT 0,
+    created_at INTEGER NOT NULL DEFAULT (strftime('%s', 'now'))
+);

crates/quicprochat-server/migrations/012_moderation.sql

@@ -0,0 +1,20 @@
+-- Moderation tables: reports and bans.
+
+CREATE TABLE IF NOT EXISTS reports (
+    id                  INTEGER PRIMARY KEY AUTOINCREMENT,
+    encrypted_report    BLOB NOT NULL,
+    conversation_id     BLOB NOT NULL,
+    reporter_identity   BLOB NOT NULL,
+    created_at          INTEGER NOT NULL DEFAULT (strftime('%s', 'now'))
+);
+
+CREATE INDEX IF NOT EXISTS idx_reports_created ON reports(created_at);
+
+CREATE TABLE IF NOT EXISTS bans (
+    identity_key    BLOB PRIMARY KEY,
+    reason          TEXT NOT NULL DEFAULT '',
+    banned_at       INTEGER NOT NULL DEFAULT (strftime('%s', 'now')),
+    expires_at      INTEGER NOT NULL DEFAULT 0
+);
+
+CREATE INDEX IF NOT EXISTS idx_bans_expires ON bans(expires_at);