fix(migrate): reorder create_project before add_workspace_id_to_project and remove foreign keys

- Move create_project migration before add_workspace_id_to_project so the
  project table exists when workspace_id column is added
- Remove all FOREIGN KEY constraints from migration SQL files

libs/migrate/lib.rs

@@ -77,12 +77,12 @@ impl MigratorTrait for Migrator {
             // Workspace tables
             Box::new(m20260411_000001_create_workspace::Migration),
             Box::new(m20260411_000002_create_workspace_membership::Migration),
-            Box::new(m20260411_000003_add_workspace_id_to_project::Migration),
             Box::new(m20260411_000004_add_invite_token_to_workspace_membership::Migration),
             Box::new(m20260412_000001_create_workspace_billing::Migration),
             Box::new(m20260412_000002_create_workspace_billing_history::Migration),
-            // Project tables
+            // Project tables (must come before add_workspace_id_to_project)
             Box::new(m20250628_000013_create_project::Migration),
+            Box::new(m20260411_000003_add_workspace_id_to_project::Migration),
             Box::new(m20250628_000014_create_project_access_log::Migration),
             Box::new(m20250628_000015_create_project_audit_log::Migration),
             Box::new(m20250628_000016_create_project_billing::Migration),

libs/migrate/sql/m20260508_000001_create_ai_conversation.sql

@@ -21,7 +21,3 @@ CREATE INDEX IF NOT EXISTS idx_ai_conv_project_id ON ai_conversation (project_id
 CREATE INDEX IF NOT EXISTS idx_ai_conv_scope ON ai_conversation (scope);
 CREATE INDEX IF NOT EXISTS idx_ai_conv_user_created ON ai_conversation (user_id, created_at DESC);
 CREATE INDEX IF NOT EXISTS idx_ai_conv_project_created ON ai_conversation (project_id, created_at DESC);
-
-ALTER TABLE ai_conversation
-    ADD CONSTRAINT fk_ai_conv_project
-    FOREIGN KEY (project_id) REFERENCES project(id) ON DELETE CASCADE;

libs/migrate/sql/m20260508_000002_create_ai_message.sql

@@ -17,11 +17,3 @@ CREATE TABLE IF NOT EXISTS ai_message (
 
 CREATE INDEX IF NOT EXISTS idx_ai_msg_conv ON ai_message (conversation_id, created_at);
 CREATE INDEX IF NOT EXISTS idx_ai_msg_parent ON ai_message (parent_message_id);
-
-ALTER TABLE ai_message
-    ADD CONSTRAINT fk_ai_msg_conv
-    FOREIGN KEY (conversation_id) REFERENCES ai_conversation(id) ON DELETE CASCADE;
-
-ALTER TABLE ai_message
-    ADD CONSTRAINT fk_ai_msg_parent
-    FOREIGN KEY (parent_message_id) REFERENCES ai_message(id) ON DELETE SET NULL;

libs/migrate/sql/m20260508_000003_create_ai_message_fork.sql

@@ -7,11 +7,3 @@ CREATE TABLE IF NOT EXISTS ai_message_fork (
 
 CREATE INDEX IF NOT EXISTS idx_ai_fork_source ON ai_message_fork (source_message_id);
 CREATE INDEX IF NOT EXISTS idx_ai_fork_fork ON ai_message_fork (fork_message_id);
-
-ALTER TABLE ai_message_fork
-    ADD CONSTRAINT fk_ai_fork_source
-    FOREIGN KEY (source_message_id) REFERENCES ai_message(id) ON DELETE CASCADE;
-
-ALTER TABLE ai_message_fork
-    ADD CONSTRAINT fk_ai_fork_fork
-    FOREIGN KEY (fork_message_id) REFERENCES ai_message(id) ON DELETE CASCADE;

libs/migrate/sql/m20260508_000004_create_ai_shared_conversation.sql

@@ -10,7 +10,3 @@ CREATE TABLE IF NOT EXISTS ai_shared_conversation (
 
 CREATE INDEX IF NOT EXISTS idx_ai_share_conv ON ai_shared_conversation (conversation_id);
 CREATE INDEX IF NOT EXISTS idx_ai_share_token ON ai_shared_conversation (share_token);
-
-ALTER TABLE ai_shared_conversation
-    ADD CONSTRAINT fk_ai_share_conv
-    FOREIGN KEY (conversation_id) REFERENCES ai_conversation(id) ON DELETE CASCADE;

libs/migrate/sql/m20260508_000007_create_project_context_setting.sql

@@ -12,7 +12,3 @@ CREATE TABLE IF NOT EXISTS project_context_setting (
 );
 
 CREATE INDEX IF NOT EXISTS idx_proj_ctx_rag_enabled ON project_context_setting (rag_enabled);
-
-ALTER TABLE project_context_setting
-    ADD CONSTRAINT fk_proj_ctx_project
-    FOREIGN KEY (project_id) REFERENCES project(id) ON DELETE CASCADE;