Add device data model and ITAM service

Introduce device, posture, and enrollment-token entities with ITAM
service policies for agent-managed fleet inventory.

Signed-off-by: Ludovic Vielle <ludovic@probo.com>

pkg/coredata/migrations/20260711T094136Z.sql

@@ -0,0 +1,41 @@
+-- Copyright (c) 2026 Probo Inc <hello@probo.com>.
+--
+-- Permission is hereby granted, free of charge, to any person obtaining a copy
+-- of this software and associated documentation files (the "Software"), to deal
+-- in the Software without restriction, including without limitation the rights
+-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+-- copies of the Software, and to permit persons to whom the Software is
+-- furnished to do so, subject to the following conditions:
+--
+-- The above copyright notice and this permission notice shall be included in
+-- all copies or substantial portions of the Software.
+--
+-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+-- SOFTWARE.
+
+CREATE TABLE device_enrollment_tokens (
+    id TEXT PRIMARY KEY,
+    tenant_id TEXT NOT NULL,
+    device_id TEXT NOT NULL REFERENCES devices(id) ON UPDATE CASCADE ON DELETE CASCADE,
+    hashed_value BYTEA NOT NULL,
+    expires_at TIMESTAMP WITH TIME ZONE NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL,
+    CONSTRAINT device_enrollment_tokens_hashed_value_unique UNIQUE (hashed_value)
+);
+
+CREATE INDEX device_enrollment_tokens_device_id_idx
+    ON device_enrollment_tokens (device_id);
+
+ALTER TABLE devices
+    ALTER COLUMN api_key_hash DROP NOT NULL;
+
+ALTER TABLE devices
+    ADD CONSTRAINT devices_active_api_key_hash_check CHECK (
+        state != 'ACTIVE'
+        OR api_key_hash IS NOT NULL
+    );