feat(ui): add identity management for tenants and users

* Implement tenant and user creation in IdentityPage
* Add API calls for managing tenants and users
* Introduce tenant-scoped API requests
* Update sidebar to include identity navigation
* Create BooleanStatusBadge component for key status

migrations/120_identity_tenancy.sql

@@ -0,0 +1,31 @@
+create table if not exists tenants (
+    id text primary key,
+    name text not null unique,
+    created_at timestamptz not null default now()
+);
+
+create table if not exists tenant_users (
+    id text primary key,
+    tenant_id text not null references tenants(id),
+    name text not null,
+    email text,
+    created_at timestamptz not null default now(),
+    unique (tenant_id, email)
+);
+
+create index if not exists tenant_users_tenant_id_idx on tenant_users (tenant_id);
+
+create table if not exists api_key_assignments (
+    key_id text primary key,
+    tenant_id text not null references tenants(id),
+    user_id text references tenant_users(id),
+    description text not null default '',
+    source text not null check (source in ('configured', 'managed')),
+    enabled boolean not null default true,
+    created_at timestamptz not null default now()
+);
+
+create table if not exists managed_api_keys (
+    key_id text primary key references api_key_assignments(key_id) on delete cascade,
+    secret_hash text not null
+);

migrations/130_tenant_foreign_keys.sql

@@ -0,0 +1,53 @@
+-- Convert tenant_key from an opaque authentication value into a real tenant
+-- relationship. Preserve legacy rows and create placeholders for historical
+-- key IDs before adding foreign keys.
+insert into tenants (id, name)
+select tenant_key, tenant_key
+from (
+    select tenant_key from projects
+    union select tenant_key from thoughts
+    union select tenant_key from stored_files
+    union select tenant_key from learnings
+    union select tenant_key from plans
+    union select tenant_key from chat_histories
+) tenant_keys
+where tenant_key is not null and tenant_key <> ''
+on conflict (id) do nothing;
+
+alter table agent_skills add column if not exists tenant_key text references tenants(id);
+alter table agent_guardrails add column if not exists tenant_key text references tenants(id);
+alter table agent_personas add column if not exists tenant_key text references tenants(id);
+alter table agent_parts add column if not exists tenant_key text references tenants(id);
+alter table agent_traits add column if not exists tenant_key text references tenants(id);
+alter table character_arcs add column if not exists tenant_key text references tenants(id);
+
+alter table agent_skills drop constraint if exists ukey_agent_skills_name;
+alter table agent_guardrails drop constraint if exists ukey_agent_guardrails_name;
+alter table agent_personas drop constraint if exists ukey_agent_personas_name;
+alter table agent_parts drop constraint if exists ukey_agent_parts_name;
+alter table agent_traits drop constraint if exists ukey_agent_traits_name;
+alter table character_arcs drop constraint if exists ukey_character_arcs_name;
+
+create unique index if not exists agent_skills_tenant_key_name_idx on agent_skills (coalesce(tenant_key, ''), name);
+create unique index if not exists agent_guardrails_tenant_key_name_idx on agent_guardrails (coalesce(tenant_key, ''), name);
+create unique index if not exists agent_personas_tenant_key_name_idx on agent_personas (coalesce(tenant_key, ''), name);
+create unique index if not exists agent_parts_tenant_key_name_idx on agent_parts (coalesce(tenant_key, ''), name);
+create unique index if not exists agent_traits_tenant_key_name_idx on agent_traits (coalesce(tenant_key, ''), name);
+create unique index if not exists character_arcs_tenant_key_name_idx on character_arcs (coalesce(tenant_key, ''), name);
+
+create index if not exists agent_skills_tenant_key_idx on agent_skills (tenant_key);
+create index if not exists agent_guardrails_tenant_key_idx on agent_guardrails (tenant_key);
+create index if not exists agent_personas_tenant_key_idx on agent_personas (tenant_key);
+create index if not exists agent_parts_tenant_key_idx on agent_parts (tenant_key);
+create index if not exists agent_traits_tenant_key_idx on agent_traits (tenant_key);
+create index if not exists character_arcs_tenant_key_idx on character_arcs (tenant_key);
+
+do $$
+declare table_name text;
+begin
+  foreach table_name in array array['projects', 'thoughts', 'stored_files', 'learnings', 'plans', 'chat_histories']
+  loop
+    execute format('alter table %I drop constraint if exists %I', table_name, table_name || '_tenant_key_fkey');
+    execute format('alter table %I add constraint %I foreign key (tenant_key) references tenants(id)', table_name, table_name || '_tenant_key_fkey');
+  end loop;
+end $$;

migrations/140_rename_tenant_key_to_tenant_id.sql

@@ -0,0 +1,44 @@
+-- Tenant data is not in use yet, so replace the earlier opaque tenant_key
+-- column name with the relational tenant_id convention everywhere.
+do $$
+declare
+  tbl text;
+  con text;
+begin
+  foreach tbl in array array[
+    'projects', 'thoughts', 'stored_files', 'learnings', 'plans', 'chat_histories',
+    'agent_skills', 'agent_guardrails', 'agent_personas', 'agent_parts',
+    'agent_traits', 'character_arcs'
+  ] loop
+    -- Fresh installs already have tenant_id from the regenerated schema;
+    -- discard that empty column so the historical migration chain converges.
+    if exists (
+      select 1 from information_schema.columns
+      where table_schema = 'public' and table_name = tbl and column_name = 'tenant_id'
+    ) and exists (
+      select 1 from information_schema.columns
+      where table_schema = 'public' and table_name = tbl and column_name = 'tenant_key'
+    ) then
+      execute format('alter table %I drop column tenant_id', tbl);
+    end if;
+    if exists (
+      select 1 from information_schema.columns
+      where table_schema = 'public' and table_name = tbl and column_name = 'tenant_key'
+    ) then
+      execute format('alter table %I rename column tenant_key to tenant_id', tbl);
+    end if;
+
+    for con in
+      select c.conname
+      from pg_constraint c
+      join pg_class r on r.oid = c.conrelid
+      join pg_namespace n on n.oid = r.relnamespace
+      join unnest(c.conkey) as k(attnum) on true
+      join pg_attribute a on a.attrelid = r.oid and a.attnum = k.attnum
+      where n.nspname = 'public' and r.relname = tbl and c.contype = 'f' and a.attname = 'tenant_id'
+    loop
+      execute format('alter table %I drop constraint %I', tbl, con);
+    end loop;
+    execute format('alter table %I add constraint %I foreign key (tenant_id) references tenants(id)', tbl, 'fk_' || tbl || '_tenant_id');
+  end loop;
+end $$;