feat(web): add auth and fix deployment checks

src/dotnet/QuantEngine.Infrastructure/Data/DbMigrator.cs

@@ -30,6 +30,32 @@ namespace QuantEngine.Infrastructure.Data
                 );
             ");
 
+            // 0b. workspace_account
+            conn.Execute(@"
+                CREATE TABLE IF NOT EXISTS workspace_account (
+                    ordinal INT NOT NULL,
+                    username TEXT PRIMARY KEY,
+                    password_hash TEXT NOT NULL,
+                    role TEXT NOT NULL DEFAULT 'Admin',
+                    is_active TEXT NOT NULL DEFAULT 'true',
+                    created_at TEXT NOT NULL,
+                    updated_at TEXT NOT NULL
+                );
+                CREATE INDEX IF NOT EXISTS idx_workspace_account_active ON workspace_account(is_active, username);
+            ");
+
+            conn.Execute(@"
+                CREATE TABLE IF NOT EXISTS workspace_session (
+                    session_token_hash TEXT PRIMARY KEY,
+                    username TEXT NOT NULL,
+                    role TEXT NOT NULL DEFAULT 'Admin',
+                    created_at TEXT NOT NULL,
+                    expires_at TEXT NOT NULL,
+                    revoked_at TEXT
+                );
+                CREATE INDEX IF NOT EXISTS idx_workspace_session_username ON workspace_session(username, expires_at DESC);
+            ");
+
             // 1. collection_runs
             conn.Execute(@"
                 CREATE TABLE IF NOT EXISTS collection_runs (
@@ -157,6 +183,16 @@ namespace QuantEngine.Infrastructure.Data
                 );
             ");
 
+            conn.Execute(@"
+                INSERT INTO quantengine.workspace_account (
+                    ordinal, username, password_hash, role, is_active, created_at, updated_at
+                )
+                SELECT 1, 'admin', '8C6976E5B5410415BDE908BD4DEE15DFB167A9C873FC4BB8A81F6F2AB448A918', 'Admin', 'true', NOW()::text, NOW()::text
+                WHERE NOT EXISTS (
+                    SELECT 1 FROM quantengine.workspace_account WHERE username = 'admin'
+                );
+            ");
+
             // 10. engine_history schema and tables
             conn.Execute(@"
                 CREATE SCHEMA IF NOT EXISTS engine_history;