feat: add ai_providers table, queries, dbauthz, audit, RBAC (#24892)

coderd/database/migrations/testdata/fixtures/000495_ai_providers.up.sql

@@ -0,0 +1,56 @@
+INSERT INTO ai_providers (
+    id,
+    type,
+    name,
+    display_name,
+    enabled,
+    deleted,
+    base_url,
+    settings
+) VALUES
+    (
+        '8e3c6e18-2b75-4c3f-9b35-9d1c6f4e1a01',
+        'openai',
+        'openai',
+        'OpenAI (Fixture)',
+        TRUE,
+        FALSE,
+        'https://api.openai.com/v1/',
+        ''
+    ),
+    (
+        '8e3c6e18-2b75-4c3f-9b35-9d1c6f4e1a02',
+        'anthropic',
+        'anthropic-bedrock',
+        'Anthropic via Bedrock (Fixture)',
+        TRUE,
+        FALSE,
+        'https://bedrock-runtime.us-west-2.amazonaws.com/',
+        '{"bedrock_region":"us-west-2","bedrock_model":"global.anthropic.claude-sonnet-4-5-20250929-v1:0","bedrock_access_key":"fixture-bedrock-access-key","bedrock_access_key_secret":"fixture-bedrock-access-key-secret"}'
+    ),
+    (
+        '8e3c6e18-2b75-4c3f-9b35-9d1c6f4e1a03',
+        'openai',
+        'openai-deleted',
+        'OpenAI (Deleted Fixture)',
+        FALSE,
+        TRUE,
+        'https://api.openai.com/v1/',
+        ''
+    );
+
+INSERT INTO ai_provider_keys (
+    id,
+    provider_id,
+    api_key
+) VALUES
+    (
+        '8e3c6e18-2b75-4c3f-9b35-9d1c6f4e1b01',
+        '8e3c6e18-2b75-4c3f-9b35-9d1c6f4e1a01',
+        'fixture-openai-key'
+    ),
+    (
+        '8e3c6e18-2b75-4c3f-9b35-9d1c6f4e1b02',
+        '8e3c6e18-2b75-4c3f-9b35-9d1c6f4e1a01',
+        'fixture-openai-key-failover'
+    );