feat: v0.3.0 — standardize codebase, centralize infra, merge QR into CMS

- Enforce axum best practices across all 13 workspace crates
  (max 200 LOC/file, no comments, no unwrap, clean architecture)
- Fix domain→infrastructure dependency inversions in imphnen-iam and imphnen-dimentorin
- Extract imphnen-storage (MinIO) and imphnen-email (Lettre) as standalone crates
- Centralize all config in ENV struct: CDN_URL, CORS_ALLOWED_ORIGINS
- Centralize SMTP through imphnen-email; remove dead HackathonConfig
- Centralize database: QR crate now shares main DB pool (single DATABASE_URL)
- Rename QR users table to qr_users to avoid collision with main users table
- Merge imphnen-qr into imphnen-cms/src/qr (13 crates, down from 14)
- Restructure imphnen-hackathon flat modules into clean architecture
- Remove all stale env vars from .env.example (SurrealDB, QR_JWT, Hackathon infra)
- Fix Dockerfile to include all current workspace crates
- Bump all crate versions 0.2.0 → 0.3.0

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Dockerfile

@@ -1,47 +1,55 @@
-FROM rust:1.86-alpine AS builder
-
-RUN apk add --no-cache \
-    curl \
-    musl-dev \
-    openssl-dev \
-    openssl-libs-static \
-    pkgconfig
-
-WORKDIR /app
-
-COPY Cargo.toml Cargo.lock ./
-
-RUN mkdir -p imphnen-backend/src imphnen-cms/src imphnen-dimentorin/src \
-    imphnen-entities/src imphnen-gacha/src imphnen-gateway/src \
-    imphnen-iam/src imphnen-libs/src imphnen-middleware/src \
-    imphnen-utils/src tests/src && \
-    echo "fn main() {}" > imphnen-backend/src/main.rs && \
-    find . -name "src" -type d -exec sh -c 'echo "// dummy" > "$1/lib.rs"' _ {} \;
-
-RUN echo '[package]\nname = "tests"\nversion = "0.1.0"\nedition = "2021"' > tests/Cargo.toml
-
-
-RUN echo -e '[package]\nname = "tests"\nversion = "0.1.0"\nedition = "2021"' > tests/Cargo.toml
-
-
-COPY imphnen-backend ./imphnen-backend
-COPY imphnen-cms ./imphnen-cms
-COPY imphnen-dimentorin ./imphnen-dimentorin
-COPY imphnen-entities ./imphnen-entities
-COPY imphnen-gacha ./imphnen-gacha
-COPY imphnen-gateway ./imphnen-gateway
-COPY imphnen-iam ./imphnen-iam
-COPY imphnen-libs ./imphnen-libs
-COPY imphnen-middleware ./imphnen-middleware
-COPY imphnen-utils ./imphnen-utils
-COPY tests ./tests
-
-RUN RUSTFLAGS="-C target-cpu=generic -C opt-level=s -C panic=abort -C codegen-units=1 -C strip=symbols" \
-    cargo build -p imphnen-backend --release && \
-    strip target/release/api && \
-    upx --best --lzma target/release/api 2>/dev/null || true
-
-FROM scratch AS runner
-COPY --from=builder /app/target/release/api /api
-COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
-ENTRYPOINT ["/api"]
+FROM rust:1.86-alpine AS builder
+
+RUN apk add --no-cache \
+    curl \
+    musl-dev \
+    openssl-dev \
+    openssl-libs-static \
+    pkgconfig
+
+WORKDIR /app
+
+COPY Cargo.toml Cargo.lock ./
+
+RUN mkdir -p \
+    imphnen-backend/src \
+    imphnen-cms/src \
+    imphnen-dimentorin/src \
+    imphnen-email/src \
+    imphnen-entities/src \
+    imphnen-gacha/src \
+    imphnen-gateway/src \
+    imphnen-hackathon/src \
+    imphnen-iam/src \
+    imphnen-libs/src \
+    imphnen-macros/src \
+    imphnen-middleware/src \
+    imphnen-storage/src \
+    imphnen-utils/src && \
+    echo "fn main() {}" > imphnen-backend/src/main.rs && \
+    find . -name "src" -type d -exec sh -c 'touch "$1/lib.rs"' _ {} \;
+
+COPY imphnen-backend ./imphnen-backend
+COPY imphnen-cms ./imphnen-cms
+COPY imphnen-dimentorin ./imphnen-dimentorin
+COPY imphnen-email ./imphnen-email
+COPY imphnen-entities ./imphnen-entities
+COPY imphnen-gacha ./imphnen-gacha
+COPY imphnen-gateway ./imphnen-gateway
+COPY imphnen-hackathon ./imphnen-hackathon
+COPY imphnen-iam ./imphnen-iam
+COPY imphnen-libs ./imphnen-libs
+COPY imphnen-macros ./imphnen-macros
+COPY imphnen-middleware ./imphnen-middleware
+COPY imphnen-storage ./imphnen-storage
+COPY imphnen-utils ./imphnen-utils
+
+RUN RUSTFLAGS="-C target-cpu=generic -C opt-level=s -C panic=abort -C codegen-units=1 -C strip=symbols" \
+    cargo build -p imphnen-backend --release && \
+    strip target/release/api && \
+    upx --best --lzma target/release/api 2>/dev/null || true
+
+FROM scratch AS runner
+COPY --from=builder /app/target/release/api /api
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+ENTRYPOINT ["/api"]