docs(01-02): complete backend API plan

- SUMMARY.md with 30 passing tests, 13 files, 3min duration
- STATE.md updated to plan 2/4 at 50% progress
- ROADMAP.md and REQUIREMENTS.md updated with COLL-01 through COLL-04

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.planning/STATE.md

@@ -3,15 +3,15 @@ gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
 status: executing
-stopped_at: Completed 01-01-PLAN.md
-last_updated: "2026-03-14T21:35:06Z"
-last_activity: 2026-03-14 — Completed 01-01 scaffolding plan
+stopped_at: Completed 01-02-PLAN.md
+last_updated: "2026-03-14T21:42:10.067Z"
+last_activity: 2026-03-14 — Completed 01-02 backend API plan
 progress:
   total_phases: 3
   completed_phases: 0
   total_plans: 4
-  completed_plans: 1
-  percent: 8
+  completed_plans: 2
+  percent: 50
 ---
 
 # Project State
@@ -26,11 +26,11 @@ See: .planning/PROJECT.md (updated 2026-03-14)
 ## Current Position
 
 Phase: 1 of 3 (Foundation and Collection)
-Plan: 1 of 4 in current phase (complete)
+Plan: 2 of 4 in current phase (complete)
 Status: Executing phase 1
-Last activity: 2026-03-14 — Completed 01-01 scaffolding plan
+Last activity: 2026-03-14 — Completed 01-02 backend API plan
 
-Progress: [█░░░░░░░░░] 8%
+Progress: [█████░░░░░] 50%
 
 ## Performance Metrics
 
@@ -50,6 +50,7 @@ Progress: [█░░░░░░░░░] 8%
 - Trend: -
 
 *Updated after each plan completion*
+| Phase 01 P02 | 3min | 2 tasks | 13 files |
 
 ## Accumulated Context
 
@@ -62,6 +63,8 @@ Recent decisions affecting current work:
 - [Roadmap]: Setups and Dashboard combined into single phase (coarse granularity)
 - [01-01]: TanStack Router requires routesDirectory config when routes are in src/client/routes
 - [01-01]: drizzle-kit CLI needs better-sqlite3 (cannot use bun:sqlite)
+- [Phase 01-02]: Service functions accept db as first param with production default for DI/testability
+- [Phase 01-02]: Routes use Hono context variables for DB injection enabling in-memory SQLite integration tests
 
 ### Pending Todos
 
@@ -74,6 +77,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-03-14T21:35:06Z
-Stopped at: Completed 01-01-PLAN.md
-Resume file: .planning/phases/01-foundation-and-collection/01-02-PLAN.md
+Last session: 2026-03-14T21:42:10.066Z
+Stopped at: Completed 01-02-PLAN.md
+Resume file: None