chore: update CI, DB init, and documentation

Update CI workflow, PostgreSQL init script, README, and obsidian technical docs.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

.gitea/workflows/ci.yaml

@@ -68,16 +68,28 @@ jobs:
       - run: go build ./...
         working-directory: backend
 
-      - run: go vet ./...
+      - name: Vet (dev tags)
+        run: go vet -tags "test,dev" ./...
         working-directory: backend
 
-      - name: Test
+      - name: Vet (prod tags)
+        run: go vet -tags "test,!dev" ./...
+        working-directory: backend
+
+      - name: Test (dev tags)
         working-directory: backend
         run: go test -tags "test,dev" -count=1 -v -timeout 180s ./...
         env:
           POSTGRES_HOST: postgres
           TEST_DB_HOST: postgres
 
+      - name: Test (prod tags — behavioral ratelimit, prod-only compile)
+        working-directory: backend
+        run: go test -tags "test,!dev" -count=1 -timeout 180s ./...
+        env:
+          POSTGRES_HOST: postgres
+          TEST_DB_HOST: postgres
+
   race:
     name: Race detector
     runs-on: ubuntu-latest
@@ -130,7 +142,7 @@ jobs:
 
       - run: PGPASSWORD=mypassword psql -h postgres -U myuser -d mydb -c "CREATE DATABASE crussell_test_db;" 2>/dev/null || true
 
-      - name: Test with race detector
+      - name: Race (dev tags)
         working-directory: backend
         run: go test -tags "test,dev" -race -count=1 -timeout 240s ./...
         env:
@@ -138,6 +150,14 @@ jobs:
           TEST_DB_HOST: postgres
           CGO_ENABLED: "1"
 
+      - name: Race (prod tags)
+        working-directory: backend
+        run: go test -tags "test,!dev" -race -count=1 -timeout 240s ./...
+        env:
+          POSTGRES_HOST: postgres
+          TEST_DB_HOST: postgres
+          CGO_ENABLED: "1"
+
   vulns:
     name: Go vulnerabilities
     runs-on: ubuntu-latest