feat(10): add CRM schema foundation - leads, activities, reminders tables

- Expand leads table with CRM fields (phone, company, status, last_contact_date, next_action, notes)
- Add activities table for immutable interaction history
- Add reminders table for follow-up scheduling
- Add relations: leads ↔ activities, leads ↔ reminders
- Add TypeScript types: Activity, NewActivity, Reminder, NewReminder
- Status enum: contacted → qualified → proposal_sent → negotiating → won → lost
- Activity types: call, email, meeting, note
- Cascade delete for data integrity
- npm run build: PASSED (0 errors)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/db/schema.ts

@@ -362,14 +362,62 @@ export const quotes = pgTable("quotes", {
     .defaultNow(),
 });
 
-// ============ LEADS TABLE (CRM — Phase 10, but needed for quotes FK) ============
-// Placeholder table for Phase 10 CRM integration
+// ============ LEADS TABLE (CRM — Phase 10) ============
 export const leads = pgTable("leads", {
   id: text("id")
     .primaryKey()
     .$defaultFn(() => nanoid()),
   name: text("name").notNull(),
   email: text("email"),
+  phone: text("phone"),
+  company: text("company"),
+  status: text("status")
+    .notNull()
+    .default("contacted"), // contacted | qualified | proposal_sent | negotiating | won | lost
+  last_contact_date: timestamp("last_contact_date", { withTimezone: true }),
+  next_action: text("next_action"),
+  next_action_date: timestamp("next_action_date", { withTimezone: true }),
+  notes: text("notes"),
+  created_at: timestamp("created_at", { withTimezone: true })
+    .notNull()
+    .defaultNow(),
+  updated_at: timestamp("updated_at", { withTimezone: true })
+    .notNull()
+    .defaultNow(),
+});
+
+// ============ ACTIVITIES TABLE (CRM interaction history) ============
+export const activities = pgTable("activities", {
+  id: text("id")
+    .primaryKey()
+    .$defaultFn(() => nanoid()),
+  lead_id: text("lead_id")
+    .notNull()
+    .references(() => leads.id, { onDelete: "cascade" }),
+  type: text("type")
+    .notNull(), // call | email | meeting | note
+  duration_minutes: integer("duration_minutes"), // optional, for calls/meetings
+  notes: text("notes").notNull(),
+  activity_date: timestamp("activity_date", { withTimezone: true })
+    .notNull(),
+  created_at: timestamp("created_at", { withTimezone: true })
+    .notNull()
+    .defaultNow(),
+});
+
+// ============ REMINDERS TABLE (CRM follow-up reminders) ============
+export const reminders = pgTable("reminders", {
+  id: text("id")
+    .primaryKey()
+    .$defaultFn(() => nanoid()),
+  lead_id: text("lead_id")
+    .notNull()
+    .references(() => leads.id, { onDelete: "cascade" }),
+  title: text("title").notNull(),
+  description: text("description"),
+  due_date: timestamp("due_date", { withTimezone: true })
+    .notNull(),
+  completed_at: timestamp("completed_at", { withTimezone: true }),
   created_at: timestamp("created_at", { withTimezone: true })
     .notNull()
     .defaultNow(),
@@ -497,6 +545,16 @@ export const offerPhaseServicesRelations = relations(offer_phase_services, ({ on
 
 export const leadsRelations = relations(leads, ({ many }) => ({
   quotes: many(quotes),
+  activities: many(activities),
+  reminders: many(reminders),
+}));
+
+export const activitiesRelations = relations(activities, ({ one }) => ({
+  lead: one(leads, { fields: [activities.lead_id], references: [leads.id] }),
+}));
+
+export const remindersRelations = relations(reminders, ({ one }) => ({
+  lead: one(leads, { fields: [reminders.lead_id], references: [leads.id] }),
 }));
 
 export const quotesRelations = relations(quotes, ({ one, many }) => ({
@@ -553,4 +611,8 @@ export type NewOfferPhaseService = typeof offer_phase_services.$inferInsert;
 export type Quote = typeof quotes.$inferSelect;
 export type NewQuote = typeof quotes.$inferInsert;
 export type Lead = typeof leads.$inferSelect;
-export type NewLead = typeof leads.$inferInsert;
+export type NewLead = typeof leads.$inferInsert;
+export type Activity = typeof activities.$inferSelect;
+export type NewActivity = typeof activities.$inferInsert;
+export type Reminder = typeof reminders.$inferSelect;
+export type NewReminder = typeof reminders.$inferInsert;