Convert backend from submodule to regular directory

Remove submodule tracking; backend is now a plain directory in the repo.
Also update deploy workflow: remove --recurse-submodules.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/internal/db/schema.sql

@@ -0,0 +1,94 @@
+-- Pamietnik database schema
+-- Applied automatically at server startup via CREATE TABLE IF NOT EXISTS.
+
+CREATE TABLE IF NOT EXISTS users (
+    user_id       TEXT PRIMARY KEY DEFAULT gen_random_uuid()::text,
+    username      TEXT NOT NULL UNIQUE,
+    password_hash TEXT NOT NULL,
+    created_at    TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE IF NOT EXISTS sessions (
+    session_id TEXT PRIMARY KEY,
+    user_id    TEXT NOT NULL REFERENCES users(user_id) ON DELETE CASCADE,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    expires_at TIMESTAMPTZ NOT NULL
+);
+CREATE INDEX IF NOT EXISTS sessions_expires_at_idx ON sessions(expires_at);
+
+CREATE TABLE IF NOT EXISTS devices (
+    device_id  TEXT PRIMARY KEY,
+    user_id    TEXT NOT NULL REFERENCES users(user_id) ON DELETE CASCADE,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE IF NOT EXISTS trackpoints (
+    id          BIGSERIAL PRIMARY KEY,
+    event_id    TEXT NOT NULL,
+    device_id   TEXT NOT NULL,
+    trip_id     TEXT NOT NULL DEFAULT '',
+    ts          TIMESTAMPTZ NOT NULL,
+    lat         DOUBLE PRECISION NOT NULL,
+    lon         DOUBLE PRECISION NOT NULL,
+    source      TEXT NOT NULL DEFAULT 'gps',
+    note        TEXT NOT NULL DEFAULT '',
+    accuracy_m  DOUBLE PRECISION,
+    speed_mps   DOUBLE PRECISION,
+    bearing_deg DOUBLE PRECISION,
+    altitude_m  DOUBLE PRECISION,
+    created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+
+    CONSTRAINT trackpoints_device_event_uniq UNIQUE (device_id, event_id)
+);
+CREATE INDEX IF NOT EXISTS trackpoints_device_ts_idx ON trackpoints(device_id, ts);
+CREATE INDEX IF NOT EXISTS trackpoints_ts_idx ON trackpoints(ts);
+
+CREATE TABLE IF NOT EXISTS stops (
+    stop_id       TEXT PRIMARY KEY DEFAULT gen_random_uuid()::text,
+    device_id     TEXT NOT NULL,
+    trip_id       TEXT NOT NULL DEFAULT '',
+    start_ts      TIMESTAMPTZ NOT NULL,
+    end_ts        TIMESTAMPTZ NOT NULL,
+    center_lat    DOUBLE PRECISION NOT NULL,
+    center_lon    DOUBLE PRECISION NOT NULL,
+    duration_s    INT NOT NULL,
+    place_label   TEXT,
+    place_details JSONB,
+    created_at    TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+CREATE INDEX IF NOT EXISTS stops_device_start_ts_idx ON stops(device_id, start_ts);
+
+CREATE TABLE IF NOT EXISTS suggestions (
+    suggestion_id TEXT PRIMARY KEY DEFAULT gen_random_uuid()::text,
+    stop_id       TEXT NOT NULL REFERENCES stops(stop_id) ON DELETE CASCADE,
+    type          TEXT NOT NULL,
+    title         TEXT NOT NULL DEFAULT '',
+    text          TEXT NOT NULL DEFAULT '',
+    created_at    TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    dismissed_at  TIMESTAMPTZ
+);
+CREATE INDEX IF NOT EXISTS suggestions_stop_id_idx ON suggestions(stop_id);
+
+CREATE TABLE IF NOT EXISTS journal_entries (
+    entry_id     TEXT PRIMARY KEY DEFAULT gen_random_uuid()::text,
+    user_id      TEXT NOT NULL REFERENCES users(user_id) ON DELETE CASCADE,
+    entry_date   DATE NOT NULL,
+    entry_time   TIME NOT NULL,
+    title        TEXT NOT NULL DEFAULT '',
+    description  TEXT NOT NULL DEFAULT '',
+    lat          DOUBLE PRECISION,
+    lon          DOUBLE PRECISION,
+    created_at   TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+CREATE INDEX IF NOT EXISTS journal_entries_user_date_idx ON journal_entries(user_id, entry_date);
+
+CREATE TABLE IF NOT EXISTS journal_images (
+    image_id      TEXT PRIMARY KEY DEFAULT gen_random_uuid()::text,
+    entry_id      TEXT NOT NULL REFERENCES journal_entries(entry_id) ON DELETE CASCADE,
+    filename      TEXT NOT NULL,
+    original_name TEXT NOT NULL DEFAULT '',
+    mime_type     TEXT NOT NULL DEFAULT '',
+    size_bytes    BIGINT NOT NULL DEFAULT 0,
+    created_at    TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+CREATE INDEX IF NOT EXISTS journal_images_entry_id_idx ON journal_images(entry_id);