refactor(store,tools): migrate IDs from UUID to bigserial int64

All internal entity lookups now use bigserial primary keys (int64) while
GUIDs are retained for external/public identification. Updated store
functions (TouchProject, UpdateThoughtMetadata, AddThoughtAttachment) to
query by id instead of guid, added GetThoughtByID, changed semanticSearch
and all tool helpers to use *int64 project IDs, and updated retry/backfill
workers to use int64 thought IDs throughout.

internal/generatedmodels/sql_public_plan_related_plans.go

@@ -9,10 +9,10 @@ import (
 
 type ModelPublicPlanRelatedPlans struct {
 	bun.BaseModel `bun:"table:public.plan_related_plans,alias:plan_related_plans"`
-	ID            resolvespec_common.SqlInt32     `bun:"id,type:serial,pk,autoincrement," json:"id"`
+	ID            resolvespec_common.SqlInt64     `bun:"id,type:bigserial,pk,autoincrement," json:"id"`
 	CreatedAt     resolvespec_common.SqlTimeStamp `bun:"created_at,type:timestamptz,default:now(),notnull," json:"created_at"`
-	PlanAID       resolvespec_common.SqlUUID      `bun:"plan_a_id,type:uuid,notnull,unique:uidx_plan_related_plans_plan_a_id_plan_b_id," json:"plan_a_id"`
-	PlanBID       resolvespec_common.SqlUUID      `bun:"plan_b_id,type:uuid,notnull,unique:uidx_plan_related_plans_plan_a_id_plan_b_id," json:"plan_b_id"`
+	PlanAID       int64                           `bun:"plan_a_id,type:bigint,notnull,unique:uidx_plan_related_plans_plan_a_id_plan_b_id," json:"plan_a_id"`
+	PlanBID       int64                           `bun:"plan_b_id,type:bigint,notnull,unique:uidx_plan_related_plans_plan_a_id_plan_b_id," json:"plan_b_id"`
 	RelPlanAID    *ModelPublicPlans               `bun:"rel:has-one,join:plan_a_id=id" json:"relplanaid,omitempty"` // Has one ModelPublicPlans
 	RelPlanBID    *ModelPublicPlans               `bun:"rel:has-one,join:plan_b_id=id" json:"relplanbid,omitempty"` // Has one ModelPublicPlans
 }