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_skills.go

@@ -9,10 +9,10 @@ import (
 
 type ModelPublicPlanSkills struct {
 	bun.BaseModel `bun:"table:public.plan_skills,alias:plan_skills"`
-	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"`
-	PlanID        resolvespec_common.SqlUUID      `bun:"plan_id,type:uuid,notnull,unique:uidx_plan_skills_plan_id_skill_id," json:"plan_id"`
-	SkillID       resolvespec_common.SqlUUID      `bun:"skill_id,type:uuid,notnull,unique:uidx_plan_skills_plan_id_skill_id," json:"skill_id"`
+	PlanID        int64                           `bun:"plan_id,type:bigint,notnull,unique:uidx_plan_skills_plan_id_skill_id," json:"plan_id"`
+	SkillID       int64                           `bun:"skill_id,type:bigint,notnull,unique:uidx_plan_skills_plan_id_skill_id," json:"skill_id"`
 	RelPlanID     *ModelPublicPlans               `bun:"rel:has-one,join:plan_id=id" json:"relplanid,omitempty"`   // Has one ModelPublicPlans
 	RelSkillID    *ModelPublicAgentSkills         `bun:"rel:has-one,join:skill_id=id" json:"relskillid,omitempty"` // Has one ModelPublicAgentSkills
 }