refactor: rename Ai* database identifiers to AI* (AIGOV-369) (#26327)

Adds `ai` to sqlc's `gen.go.initialisms` in `coderd/database/sqlc.yaml`
so the generated DB code follows Go's initialism convention. Adds the
matching `ai` -> `AI` case to the dbgen PascalCase helper
(`scripts/dbgen/main.go`) so the corresponding `dbmem` / mock
identifiers stay in sync. `make gen` regenerates the rest; hand-written
call sites that consume DB-generated identifiers
(`enterprise/audit/table.go`, `coderd/database/modelmethods.go`,
`enterprise/coderd/aigatewaykeys.go`, `coderd/database/dbauthz/*`, etc.)
are updated to match.

Scope is deliberately limited to the database layer:

- `coderd/rbac/*` (resource and scope generators) is untouched —
`ResourceAi*` / `ScopeAi*` constants stay on main's casing.
- `codersdk/*` (Go SDK) is untouched — `codersdk.ResourceAi*` /
`codersdk.APIKeyScopeAi*` constants stay on main's casing, so external
Go SDK consumers see no source-level break.
- `Aibridge*` identifiers (one SQL token `aibridge`, not `ai_bridge`)
are out of scope.

On-the-wire values are unchanged: enum strings, RBAC resource type
strings, API key scope strings, and JSON tags all stay the same. The
HTTP/JSON surface is unaffected.

Refs:
[AIGOV-369](https://linear.app/codercom/issue/AIGOV-369/change-ai-references-in-coderddatabasemodelsgo-to-ai)

🤖 Generated with [Coder Agents](https://coder.com)

coderd/database/modelmethods.go

@@ -84,38 +84,38 @@ type AuditableGroup struct {
 	Members []GroupMemberTable `json:"members"`
 }
 
-// AuditableGroupAiBudget is the audit-log representation of GroupAiBudget.
+// AuditableGroupAIBudget is the audit-log representation of GroupAIBudget.
 // It enriches the raw record with the group's name and a human-readable
 // spend limit so audit entries can display meaningful values instead of
 // UUIDs and micros.
-type AuditableGroupAiBudget struct {
-	GroupAiBudget
+type AuditableGroupAIBudget struct {
+	GroupAIBudget
 	GroupName  string `json:"group_name"`
 	SpendLimit string `json:"spend_limit"`
 }
 
-func (b GroupAiBudget) Auditable(groupName string) AuditableGroupAiBudget {
-	return AuditableGroupAiBudget{
-		GroupAiBudget: b,
+func (b GroupAIBudget) Auditable(groupName string) AuditableGroupAIBudget {
+	return AuditableGroupAIBudget{
+		GroupAIBudget: b,
 		GroupName:     groupName,
 		SpendLimit:    fmt.Sprintf("$%.2f", float64(b.SpendLimitMicros)/1_000_000),
 	}
 }
 
-// AuditableUserAiBudgetOverride is the audit-log representation of
-// UserAiBudgetOverride. It enriches the raw record with the username, the
+// AuditableUserAIBudgetOverride is the audit-log representation of
+// UserAIBudgetOverride. It enriches the raw record with the username, the
 // attributed group's name, and a human-readable spend limit so audit
 // entries can display meaningful values instead of UUIDs and micros.
-type AuditableUserAiBudgetOverride struct {
-	UserAiBudgetOverride
+type AuditableUserAIBudgetOverride struct {
+	UserAIBudgetOverride
 	Username   string `json:"username"`
 	GroupName  string `json:"group_name"`
 	SpendLimit string `json:"spend_limit"`
 }
 
-func (o UserAiBudgetOverride) Auditable(username, groupName string) AuditableUserAiBudgetOverride {
-	return AuditableUserAiBudgetOverride{
-		UserAiBudgetOverride: o,
+func (o UserAIBudgetOverride) Auditable(username, groupName string) AuditableUserAIBudgetOverride {
+	return AuditableUserAIBudgetOverride{
+		UserAIBudgetOverride: o,
 		Username:             username,
 		GroupName:            groupName,
 		SpendLimit:           fmt.Sprintf("$%.2f", float64(o.SpendLimitMicros)/1_000_000),